diff --git a/core/crypto/crypto.cpp b/core/crypto/crypto.cpp
index d3d00794105..62bacadf91a 100644
--- a/core/crypto/crypto.cpp
+++ b/core/crypto/crypto.cpp
@@ -36,10 +36,10 @@
 
 /// Resources
 
-CryptoKey *(*CryptoKey::_create)() = nullptr;
-CryptoKey *CryptoKey::create() {
+CryptoKey *(*CryptoKey::_create)(bool p_notify_postinitialize) = nullptr;
+CryptoKey *CryptoKey::create(bool p_notify_postinitialize) {
 	if (_create) {
-		return _create();
+		return _create(p_notify_postinitialize);
 	}
 	return nullptr;
 }
@@ -52,10 +52,10 @@ void CryptoKey::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("load_from_string", "string_key", "public_only"), &CryptoKey::load_from_string, DEFVAL(false));
 }
 
-X509Certificate *(*X509Certificate::_create)() = nullptr;
-X509Certificate *X509Certificate::create() {
+X509Certificate *(*X509Certificate::_create)(bool p_notify_postinitialize) = nullptr;
+X509Certificate *X509Certificate::create(bool p_notify_postinitialize) {
 	if (_create) {
-		return _create();
+		return _create(p_notify_postinitialize);
 	}
 	return nullptr;
 }
@@ -116,10 +116,10 @@ void HMACContext::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("finish"), &HMACContext::finish);
 }
 
-HMACContext *(*HMACContext::_create)() = nullptr;
-HMACContext *HMACContext::create() {
+HMACContext *(*HMACContext::_create)(bool p_notify_postinitialize) = nullptr;
+HMACContext *HMACContext::create(bool p_notify_postinitialize) {
 	if (_create) {
-		return _create();
+		return _create(p_notify_postinitialize);
 	}
 	ERR_FAIL_V_MSG(nullptr, "HMACContext is not available when the mbedtls module is disabled.");
 }
@@ -127,10 +127,10 @@ HMACContext *HMACContext::create() {
 /// Crypto
 
 void (*Crypto::_load_default_certificates)(const String &p_path) = nullptr;
-Crypto *(*Crypto::_create)() = nullptr;
-Crypto *Crypto::create() {
+Crypto *(*Crypto::_create)(bool p_notify_postinitialize) = nullptr;
+Crypto *Crypto::create(bool p_notify_postinitialize) {
 	if (_create) {
-		return _create();
+		return _create(p_notify_postinitialize);
 	}
 	ERR_FAIL_V_MSG(nullptr, "Crypto is not available when the mbedtls module is disabled.");
 }
diff --git a/core/crypto/crypto.h b/core/crypto/crypto.h
index 16649422cff..c19e6b6773b 100644
--- a/core/crypto/crypto.h
+++ b/core/crypto/crypto.h
@@ -42,10 +42,10 @@ class CryptoKey : public Resource {
 
 protected:
 	static void _bind_methods();
-	static CryptoKey *(*_create)();
+	static CryptoKey *(*_create)(bool p_notify_postinitialize);
 
 public:
-	static CryptoKey *create();
+	static CryptoKey *create(bool p_notify_postinitialize = true);
 	virtual Error load(const String &p_path, bool p_public_only = false) = 0;
 	virtual Error save(const String &p_path, bool p_public_only = false) = 0;
 	virtual String save_to_string(bool p_public_only = false) = 0;
@@ -58,10 +58,10 @@ class X509Certificate : public Resource {
 
 protected:
 	static void _bind_methods();
-	static X509Certificate *(*_create)();
+	static X509Certificate *(*_create)(bool p_notify_postinitialize);
 
 public:
-	static X509Certificate *create();
+	static X509Certificate *create(bool p_notify_postinitialize = true);
 	virtual Error load(const String &p_path) = 0;
 	virtual Error load_from_memory(const uint8_t *p_buffer, int p_len) = 0;
 	virtual Error save(const String &p_path) = 0;
@@ -106,10 +106,10 @@ class HMACContext : public RefCounted {
 
 protected:
 	static void _bind_methods();
-	static HMACContext *(*_create)();
+	static HMACContext *(*_create)(bool p_notify_postinitialize);
 
 public:
-	static HMACContext *create();
+	static HMACContext *create(bool p_notify_postinitialize = true);
 
 	virtual Error start(HashingContext::HashType p_hash_type, const PackedByteArray &p_key) = 0;
 	virtual Error update(const PackedByteArray &p_data) = 0;
@@ -124,11 +124,11 @@ class Crypto : public RefCounted {
 
 protected:
 	static void _bind_methods();
-	static Crypto *(*_create)();
+	static Crypto *(*_create)(bool p_notify_postinitialize);
 	static void (*_load_default_certificates)(const String &p_path);
 
 public:
-	static Crypto *create();
+	static Crypto *create(bool p_notify_postinitialize = true);
 	static void load_default_certificates(const String &p_path);
 
 	virtual PackedByteArray generate_random_bytes(int p_bytes) = 0;
diff --git a/core/extension/gdextension.cpp b/core/extension/gdextension.cpp
index cb6832ea398..e016ddfaaaf 100644
--- a/core/extension/gdextension.cpp
+++ b/core/extension/gdextension.cpp
@@ -382,7 +382,7 @@ public:
 
 #ifndef DISABLE_DEPRECATED
 void GDExtension::_register_extension_class(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo *p_extension_funcs) {
-	const GDExtensionClassCreationInfo3 class_info3 = {
+	const GDExtensionClassCreationInfo4 class_info4 = {
 		p_extension_funcs->is_virtual, // GDExtensionBool is_virtual;
 		p_extension_funcs->is_abstract, // GDExtensionBool is_abstract;
 		true, // GDExtensionBool is_exposed;
@@ -398,7 +398,7 @@ void GDExtension::_register_extension_class(GDExtensionClassLibraryPtr p_library
 		p_extension_funcs->to_string_func, // GDExtensionClassToString to_string_func;
 		p_extension_funcs->reference_func, // GDExtensionClassReference reference_func;
 		p_extension_funcs->unreference_func, // GDExtensionClassUnreference unreference_func;
-		p_extension_funcs->create_instance_func, // GDExtensionClassCreateInstance create_instance_func; /* this one is mandatory */
+		nullptr, // GDExtensionClassCreateInstance2 create_instance_func; /* this one is mandatory */
 		p_extension_funcs->free_instance_func, // GDExtensionClassFreeInstance free_instance_func; /* this one is mandatory */
 		nullptr, // GDExtensionClassRecreateInstance recreate_instance_func;
 		p_extension_funcs->get_virtual_func, // GDExtensionClassGetVirtual get_virtual_func;
@@ -411,12 +411,13 @@ void GDExtension::_register_extension_class(GDExtensionClassLibraryPtr p_library
 	const ClassCreationDeprecatedInfo legacy = {
 		p_extension_funcs->notification_func, // GDExtensionClassNotification notification_func;
 		p_extension_funcs->free_property_list_func, // GDExtensionClassFreePropertyList free_property_list_func;
+		p_extension_funcs->create_instance_func, // GDExtensionClassCreateInstance create_instance_func;
 	};
-	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, &class_info3, &legacy);
+	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, &class_info4, &legacy);
 }
 
 void GDExtension::_register_extension_class2(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo2 *p_extension_funcs) {
-	const GDExtensionClassCreationInfo3 class_info3 = {
+	const GDExtensionClassCreationInfo4 class_info4 = {
 		p_extension_funcs->is_virtual, // GDExtensionBool is_virtual;
 		p_extension_funcs->is_abstract, // GDExtensionBool is_abstract;
 		p_extension_funcs->is_exposed, // GDExtensionBool is_exposed;
@@ -432,7 +433,7 @@ void GDExtension::_register_extension_class2(GDExtensionClassLibraryPtr p_librar
 		p_extension_funcs->to_string_func, // GDExtensionClassToString to_string_func;
 		p_extension_funcs->reference_func, // GDExtensionClassReference reference_func;
 		p_extension_funcs->unreference_func, // GDExtensionClassUnreference unreference_func;
-		p_extension_funcs->create_instance_func, // GDExtensionClassCreateInstance create_instance_func; /* this one is mandatory */
+		nullptr, // GDExtensionClassCreateInstance2 create_instance_func; /* this one is mandatory */
 		p_extension_funcs->free_instance_func, // GDExtensionClassFreeInstance free_instance_func; /* this one is mandatory */
 		p_extension_funcs->recreate_instance_func, // GDExtensionClassRecreateInstance recreate_instance_func;
 		p_extension_funcs->get_virtual_func, // GDExtensionClassGetVirtual get_virtual_func;
@@ -445,16 +446,53 @@ void GDExtension::_register_extension_class2(GDExtensionClassLibraryPtr p_librar
 	const ClassCreationDeprecatedInfo legacy = {
 		nullptr, // GDExtensionClassNotification notification_func;
 		p_extension_funcs->free_property_list_func, // GDExtensionClassFreePropertyList free_property_list_func;
+		p_extension_funcs->create_instance_func, // GDExtensionClassCreateInstance create_instance_func;
 	};
-	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, &class_info3, &legacy);
+	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, &class_info4, &legacy);
 }
-#endif // DISABLE_DEPRECATED
 
 void GDExtension::_register_extension_class3(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo3 *p_extension_funcs) {
+	const GDExtensionClassCreationInfo4 class_info4 = {
+		p_extension_funcs->is_virtual, // GDExtensionBool is_virtual;
+		p_extension_funcs->is_abstract, // GDExtensionBool is_abstract;
+		p_extension_funcs->is_exposed, // GDExtensionBool is_exposed;
+		p_extension_funcs->is_runtime, // GDExtensionBool is_runtime;
+		p_extension_funcs->set_func, // GDExtensionClassSet set_func;
+		p_extension_funcs->get_func, // GDExtensionClassGet get_func;
+		p_extension_funcs->get_property_list_func, // GDExtensionClassGetPropertyList get_property_list_func;
+		p_extension_funcs->free_property_list_func, // GDExtensionClassFreePropertyList free_property_list_func;
+		p_extension_funcs->property_can_revert_func, // GDExtensionClassPropertyCanRevert property_can_revert_func;
+		p_extension_funcs->property_get_revert_func, // GDExtensionClassPropertyGetRevert property_get_revert_func;
+		p_extension_funcs->validate_property_func, // GDExtensionClassValidateProperty validate_property_func;
+		p_extension_funcs->notification_func, // GDExtensionClassNotification2 notification_func;
+		p_extension_funcs->to_string_func, // GDExtensionClassToString to_string_func;
+		p_extension_funcs->reference_func, // GDExtensionClassReference reference_func;
+		p_extension_funcs->unreference_func, // GDExtensionClassUnreference unreference_func;
+		nullptr, // GDExtensionClassCreateInstance2 create_instance_func; /* this one is mandatory */
+		p_extension_funcs->free_instance_func, // GDExtensionClassFreeInstance free_instance_func; /* this one is mandatory */
+		p_extension_funcs->recreate_instance_func, // GDExtensionClassRecreateInstance recreate_instance_func;
+		p_extension_funcs->get_virtual_func, // GDExtensionClassGetVirtual get_virtual_func;
+		p_extension_funcs->get_virtual_call_data_func, // GDExtensionClassGetVirtualCallData get_virtual_call_data_func;
+		p_extension_funcs->call_virtual_with_data_func, // GDExtensionClassCallVirtualWithData call_virtual_func;
+		p_extension_funcs->get_rid_func, // GDExtensionClassGetRID get_rid;
+		p_extension_funcs->class_userdata, // void *class_userdata;
+	};
+
+	const ClassCreationDeprecatedInfo legacy = {
+		nullptr, // GDExtensionClassNotification notification_func;
+		nullptr, // GDExtensionClassFreePropertyList free_property_list_func;
+		p_extension_funcs->create_instance_func, // GDExtensionClassCreateInstance2 create_instance_func;
+	};
+	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, &class_info4, &legacy);
+}
+
+#endif // DISABLE_DEPRECATED
+
+void GDExtension::_register_extension_class4(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo4 *p_extension_funcs) {
 	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, p_extension_funcs);
 }
 
-void GDExtension::_register_extension_class_internal(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo3 *p_extension_funcs, const ClassCreationDeprecatedInfo *p_deprecated_funcs) {
+void GDExtension::_register_extension_class_internal(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo4 *p_extension_funcs, const ClassCreationDeprecatedInfo *p_deprecated_funcs) {
 	GDExtension *self = reinterpret_cast<GDExtension *>(p_library);
 
 	StringName class_name = *reinterpret_cast<const StringName *>(p_class_name);
@@ -530,6 +568,7 @@ void GDExtension::_register_extension_class_internal(GDExtensionClassLibraryPtr
 	if (p_deprecated_funcs) {
 		extension->gdextension.notification = p_deprecated_funcs->notification_func;
 		extension->gdextension.free_property_list = p_deprecated_funcs->free_property_list_func;
+		extension->gdextension.create_instance = p_deprecated_funcs->create_instance_func;
 	}
 #endif // DISABLE_DEPRECATED
 	extension->gdextension.notification2 = p_extension_funcs->notification_func;
@@ -537,7 +576,7 @@ void GDExtension::_register_extension_class_internal(GDExtensionClassLibraryPtr
 	extension->gdextension.reference = p_extension_funcs->reference_func;
 	extension->gdextension.unreference = p_extension_funcs->unreference_func;
 	extension->gdextension.class_userdata = p_extension_funcs->class_userdata;
-	extension->gdextension.create_instance = p_extension_funcs->create_instance_func;
+	extension->gdextension.create_instance2 = p_extension_funcs->create_instance_func;
 	extension->gdextension.free_instance = p_extension_funcs->free_instance_func;
 	extension->gdextension.recreate_instance = p_extension_funcs->recreate_instance_func;
 	extension->gdextension.get_virtual = p_extension_funcs->get_virtual_func;
@@ -888,8 +927,9 @@ void GDExtension::initialize_gdextensions() {
 #ifndef DISABLE_DEPRECATED
 	register_interface_function("classdb_register_extension_class", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class);
 	register_interface_function("classdb_register_extension_class2", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class2);
-#endif // DISABLE_DEPRECATED
 	register_interface_function("classdb_register_extension_class3", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class3);
+#endif // DISABLE_DEPRECATED
+	register_interface_function("classdb_register_extension_class4", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class4);
 	register_interface_function("classdb_register_extension_class_method", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class_method);
 	register_interface_function("classdb_register_extension_class_virtual_method", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class_virtual_method);
 	register_interface_function("classdb_register_extension_class_integer_constant", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class_integer_constant);
diff --git a/core/extension/gdextension.h b/core/extension/gdextension.h
index 9393e7399ba..20fe27b8a87 100644
--- a/core/extension/gdextension.h
+++ b/core/extension/gdextension.h
@@ -72,15 +72,17 @@ class GDExtension : public Resource {
 #ifndef DISABLE_DEPRECATED
 		GDExtensionClassNotification notification_func = nullptr;
 		GDExtensionClassFreePropertyList free_property_list_func = nullptr;
+		GDExtensionClassCreateInstance create_instance_func = nullptr;
 #endif // DISABLE_DEPRECATED
 	};
 
 #ifndef DISABLE_DEPRECATED
 	static void _register_extension_class(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo *p_extension_funcs);
 	static void _register_extension_class2(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo2 *p_extension_funcs);
-#endif // DISABLE_DEPRECATED
 	static void _register_extension_class3(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo3 *p_extension_funcs);
-	static void _register_extension_class_internal(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo3 *p_extension_funcs, const ClassCreationDeprecatedInfo *p_deprecated_funcs = nullptr);
+#endif // DISABLE_DEPRECATED
+	static void _register_extension_class4(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo4 *p_extension_funcs);
+	static void _register_extension_class_internal(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo4 *p_extension_funcs, const ClassCreationDeprecatedInfo *p_deprecated_funcs = nullptr);
 	static void _register_extension_class_method(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, const GDExtensionClassMethodInfo *p_method_info);
 	static void _register_extension_class_virtual_method(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, const GDExtensionClassVirtualMethodInfo *p_method_info);
 	static void _register_extension_class_integer_constant(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_enum_name, GDExtensionConstStringNamePtr p_constant_name, GDExtensionInt p_constant_value, GDExtensionBool p_is_bitfield);
diff --git a/core/extension/gdextension_interface.cpp b/core/extension/gdextension_interface.cpp
index 85f83eecfdd..a5a0fc906aa 100644
--- a/core/extension/gdextension_interface.cpp
+++ b/core/extension/gdextension_interface.cpp
@@ -1515,10 +1515,17 @@ static GDExtensionMethodBindPtr gdextension_classdb_get_method_bind(GDExtensionC
 	return (GDExtensionMethodBindPtr)mb;
 }
 
+#ifndef DISABLE_DEPRECATED
 static GDExtensionObjectPtr gdextension_classdb_construct_object(GDExtensionConstStringNamePtr p_classname) {
 	const StringName classname = *reinterpret_cast<const StringName *>(p_classname);
 	return (GDExtensionObjectPtr)ClassDB::instantiate_no_placeholders(classname);
 }
+#endif
+
+static GDExtensionObjectPtr gdextension_classdb_construct_object2(GDExtensionConstStringNamePtr p_classname) {
+	const StringName classname = *reinterpret_cast<const StringName *>(p_classname);
+	return (GDExtensionObjectPtr)ClassDB::instantiate_without_postinitialization(classname);
+}
 
 static void *gdextension_classdb_get_class_tag(GDExtensionConstStringNamePtr p_classname) {
 	const StringName classname = *reinterpret_cast<const StringName *>(p_classname);
@@ -1701,7 +1708,10 @@ void gdextension_setup_interface() {
 #endif // DISABLE_DEPRECATED
 	REGISTER_INTERFACE_FUNC(callable_custom_create2);
 	REGISTER_INTERFACE_FUNC(callable_custom_get_userdata);
+#ifndef DISABLE_DEPRECATED
 	REGISTER_INTERFACE_FUNC(classdb_construct_object);
+#endif // DISABLE_DEPRECATED
+	REGISTER_INTERFACE_FUNC(classdb_construct_object2);
 	REGISTER_INTERFACE_FUNC(classdb_get_method_bind);
 	REGISTER_INTERFACE_FUNC(classdb_get_class_tag);
 	REGISTER_INTERFACE_FUNC(editor_add_plugin);
diff --git a/core/extension/gdextension_interface.h b/core/extension/gdextension_interface.h
index fce377f9673..cac76d39bdb 100644
--- a/core/extension/gdextension_interface.h
+++ b/core/extension/gdextension_interface.h
@@ -268,6 +268,7 @@ typedef void (*GDExtensionClassReference)(GDExtensionClassInstancePtr p_instance
 typedef void (*GDExtensionClassUnreference)(GDExtensionClassInstancePtr p_instance);
 typedef void (*GDExtensionClassCallVirtual)(GDExtensionClassInstancePtr p_instance, const GDExtensionConstTypePtr *p_args, GDExtensionTypePtr r_ret);
 typedef GDExtensionObjectPtr (*GDExtensionClassCreateInstance)(void *p_class_userdata);
+typedef GDExtensionObjectPtr (*GDExtensionClassCreateInstance2)(void *p_class_userdata, bool p_notify_postinitialize);
 typedef void (*GDExtensionClassFreeInstance)(void *p_class_userdata, GDExtensionClassInstancePtr p_instance);
 typedef GDExtensionClassInstancePtr (*GDExtensionClassRecreateInstance)(void *p_class_userdata, GDExtensionObjectPtr p_object);
 typedef GDExtensionClassCallVirtual (*GDExtensionClassGetVirtual)(void *p_class_userdata, GDExtensionConstStringNamePtr p_name);
@@ -292,7 +293,7 @@ typedef struct {
 	GDExtensionClassGetVirtual get_virtual_func; // Queries a virtual function by name and returns a callback to invoke the requested virtual function.
 	GDExtensionClassGetRID get_rid_func;
 	void *class_userdata; // Per-class user data, later accessible in instance bindings.
-} GDExtensionClassCreationInfo; // Deprecated. Use GDExtensionClassCreationInfo3 instead.
+} GDExtensionClassCreationInfo; // Deprecated. Use GDExtensionClassCreationInfo4 instead.
 
 typedef struct {
 	GDExtensionBool is_virtual;
@@ -325,7 +326,7 @@ typedef struct {
 	GDExtensionClassCallVirtualWithData call_virtual_with_data_func;
 	GDExtensionClassGetRID get_rid_func;
 	void *class_userdata; // Per-class user data, later accessible in instance bindings.
-} GDExtensionClassCreationInfo2; // Deprecated. Use GDExtensionClassCreationInfo3 instead.
+} GDExtensionClassCreationInfo2; // Deprecated. Use GDExtensionClassCreationInfo4 instead.
 
 typedef struct {
 	GDExtensionBool is_virtual;
@@ -359,7 +360,41 @@ typedef struct {
 	GDExtensionClassCallVirtualWithData call_virtual_with_data_func;
 	GDExtensionClassGetRID get_rid_func;
 	void *class_userdata; // Per-class user data, later accessible in instance bindings.
-} GDExtensionClassCreationInfo3;
+} GDExtensionClassCreationInfo3; // Deprecated. Use GDExtensionClassCreationInfo4 instead.
+
+typedef struct {
+	GDExtensionBool is_virtual;
+	GDExtensionBool is_abstract;
+	GDExtensionBool is_exposed;
+	GDExtensionBool is_runtime;
+	GDExtensionClassSet set_func;
+	GDExtensionClassGet get_func;
+	GDExtensionClassGetPropertyList get_property_list_func;
+	GDExtensionClassFreePropertyList2 free_property_list_func;
+	GDExtensionClassPropertyCanRevert property_can_revert_func;
+	GDExtensionClassPropertyGetRevert property_get_revert_func;
+	GDExtensionClassValidateProperty validate_property_func;
+	GDExtensionClassNotification2 notification_func;
+	GDExtensionClassToString to_string_func;
+	GDExtensionClassReference reference_func;
+	GDExtensionClassUnreference unreference_func;
+	GDExtensionClassCreateInstance2 create_instance_func; // (Default) constructor; mandatory. If the class is not instantiable, consider making it virtual or abstract.
+	GDExtensionClassFreeInstance free_instance_func; // Destructor; mandatory.
+	GDExtensionClassRecreateInstance recreate_instance_func;
+	// Queries a virtual function by name and returns a callback to invoke the requested virtual function.
+	GDExtensionClassGetVirtual get_virtual_func;
+	// Paired with `call_virtual_with_data_func`, this is an alternative to `get_virtual_func` for extensions that
+	// need or benefit from extra data when calling virtual functions.
+	// Returns user data that will be passed to `call_virtual_with_data_func`.
+	// Returning `NULL` from this function signals to Godot that the virtual function is not overridden.
+	// Data returned from this function should be managed by the extension and must be valid until the extension is deinitialized.
+	// You should supply either `get_virtual_func`, or `get_virtual_call_data_func` with `call_virtual_with_data_func`.
+	GDExtensionClassGetVirtualCallData get_virtual_call_data_func;
+	// Used to call virtual functions when `get_virtual_call_data_func` is not null.
+	GDExtensionClassCallVirtualWithData call_virtual_with_data_func;
+	GDExtensionClassGetRID get_rid_func;
+	void *class_userdata; // Per-class user data, later accessible in instance bindings.
+} GDExtensionClassCreationInfo4;
 
 typedef void *GDExtensionClassLibraryPtr;
 
@@ -2680,6 +2715,7 @@ typedef void *(*GDExtensionInterfaceCallableCustomGetUserData)(GDExtensionConstT
 /**
  * @name classdb_construct_object
  * @since 4.1
+ * @deprecated in Godot 4.4. Use `classdb_construct_object2` instead.
  *
  * Constructs an Object of the requested class.
  *
@@ -2691,6 +2727,22 @@ typedef void *(*GDExtensionInterfaceCallableCustomGetUserData)(GDExtensionConstT
  */
 typedef GDExtensionObjectPtr (*GDExtensionInterfaceClassdbConstructObject)(GDExtensionConstStringNamePtr p_classname);
 
+/**
+ * @name classdb_construct_object2
+ * @since 4.4
+ *
+ * Constructs an Object of the requested class.
+ *
+ * The passed class must be a built-in godot class, or an already-registered extension class. In both cases, object_set_instance() should be called to fully initialize the object.
+ *
+ * "NOTIFICATION_POSTINITIALIZE" must be sent after construction.
+ *
+ * @param p_classname A pointer to a StringName with the class name.
+ *
+ * @return A pointer to the newly created Object.
+ */
+typedef GDExtensionObjectPtr (*GDExtensionInterfaceClassdbConstructObject2)(GDExtensionConstStringNamePtr p_classname);
+
 /**
  * @name classdb_get_method_bind
  * @since 4.1
@@ -2722,7 +2774,7 @@ typedef void *(*GDExtensionInterfaceClassdbGetClassTag)(GDExtensionConstStringNa
 /**
  * @name classdb_register_extension_class
  * @since 4.1
- * @deprecated in Godot 4.2. Use `classdb_register_extension_class3` instead.
+ * @deprecated in Godot 4.2. Use `classdb_register_extension_class4` instead.
  *
  * Registers an extension class in the ClassDB.
  *
@@ -2738,7 +2790,7 @@ typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClass)(GDExtensionCla
 /**
  * @name classdb_register_extension_class2
  * @since 4.2
- * @deprecated in Godot 4.3. Use `classdb_register_extension_class3` instead.
+ * @deprecated in Godot 4.3. Use `classdb_register_extension_class4` instead.
  *
  * Registers an extension class in the ClassDB.
  *
@@ -2754,6 +2806,7 @@ typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClass2)(GDExtensionCl
 /**
  * @name classdb_register_extension_class3
  * @since 4.3
+ * @deprecated in Godot 4.4. Use `classdb_register_extension_class4` instead.
  *
  * Registers an extension class in the ClassDB.
  *
@@ -2766,6 +2819,21 @@ typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClass2)(GDExtensionCl
  */
 typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClass3)(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo3 *p_extension_funcs);
 
+/**
+ * @name classdb_register_extension_class4
+ * @since 4.4
+ *
+ * Registers an extension class in the ClassDB.
+ *
+ * Provided struct can be safely freed once the function returns.
+ *
+ * @param p_library A pointer the library received by the GDExtension's entry point function.
+ * @param p_class_name A pointer to a StringName with the class name.
+ * @param p_parent_class_name A pointer to a StringName with the parent class name.
+ * @param p_extension_funcs A pointer to a GDExtensionClassCreationInfo2 struct.
+ */
+typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClass4)(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo4 *p_extension_funcs);
+
 /**
  * @name classdb_register_extension_class_method
  * @since 4.1
diff --git a/core/io/dtls_server.cpp b/core/io/dtls_server.cpp
index 07d62d3a8d4..7638328dc33 100644
--- a/core/io/dtls_server.cpp
+++ b/core/io/dtls_server.cpp
@@ -33,12 +33,12 @@
 #include "core/config/project_settings.h"
 #include "core/io/file_access.h"
 
-DTLSServer *(*DTLSServer::_create)() = nullptr;
+DTLSServer *(*DTLSServer::_create)(bool p_notify_postinitialize) = nullptr;
 bool DTLSServer::available = false;
 
-DTLSServer *DTLSServer::create() {
+DTLSServer *DTLSServer::create(bool p_notify_postinitialize) {
 	if (_create) {
-		return _create();
+		return _create(p_notify_postinitialize);
 	}
 	return nullptr;
 }
diff --git a/core/io/dtls_server.h b/core/io/dtls_server.h
index f3fbde3c152..5ffed1ecc38 100644
--- a/core/io/dtls_server.h
+++ b/core/io/dtls_server.h
@@ -38,14 +38,14 @@ class DTLSServer : public RefCounted {
 	GDCLASS(DTLSServer, RefCounted);
 
 protected:
-	static DTLSServer *(*_create)();
+	static DTLSServer *(*_create)(bool p_notify_postinitialize);
 	static void _bind_methods();
 
 	static bool available;
 
 public:
 	static bool is_available();
-	static DTLSServer *create();
+	static DTLSServer *create(bool p_notify_postinitialize = true);
 
 	virtual Error setup(Ref<TLSOptions> p_options) = 0;
 	virtual void stop() = 0;
diff --git a/core/io/http_client.cpp b/core/io/http_client.cpp
index 833fd1adc38..fc91341bedd 100644
--- a/core/io/http_client.cpp
+++ b/core/io/http_client.cpp
@@ -42,9 +42,9 @@ const char *HTTPClient::_methods[METHOD_MAX] = {
 	"PATCH"
 };
 
-HTTPClient *HTTPClient::create() {
+HTTPClient *HTTPClient::create(bool p_notify_postinitialize) {
 	if (_create) {
-		return _create();
+		return _create(p_notify_postinitialize);
 	}
 	return nullptr;
 }
diff --git a/core/io/http_client.h b/core/io/http_client.h
index 9e018182e37..59452911221 100644
--- a/core/io/http_client.h
+++ b/core/io/http_client.h
@@ -158,12 +158,12 @@ protected:
 	Error _request_raw(Method p_method, const String &p_url, const Vector<String> &p_headers, const Vector<uint8_t> &p_body);
 	Error _request(Method p_method, const String &p_url, const Vector<String> &p_headers, const String &p_body = String());
 
-	static HTTPClient *(*_create)();
+	static HTTPClient *(*_create)(bool p_notify_postinitialize);
 
 	static void _bind_methods();
 
 public:
-	static HTTPClient *create();
+	static HTTPClient *create(bool p_notify_postinitialize = true);
 
 	String query_string_from_dict(const Dictionary &p_dict);
 	Error verify_headers(const Vector<String> &p_headers);
diff --git a/core/io/http_client_tcp.cpp b/core/io/http_client_tcp.cpp
index 2f45238951b..70fcad543a1 100644
--- a/core/io/http_client_tcp.cpp
+++ b/core/io/http_client_tcp.cpp
@@ -35,8 +35,8 @@
 #include "core/io/stream_peer_tls.h"
 #include "core/version.h"
 
-HTTPClient *HTTPClientTCP::_create_func() {
-	return memnew(HTTPClientTCP);
+HTTPClient *HTTPClientTCP::_create_func(bool p_notify_postinitialize) {
+	return static_cast<HTTPClient *>(ClassDB::creator<HTTPClientTCP>(p_notify_postinitialize));
 }
 
 Error HTTPClientTCP::connect_to_host(const String &p_host, int p_port, Ref<TLSOptions> p_options) {
@@ -792,6 +792,6 @@ HTTPClientTCP::HTTPClientTCP() {
 	request_buffer.instantiate();
 }
 
-HTTPClient *(*HTTPClient::_create)() = HTTPClientTCP::_create_func;
+HTTPClient *(*HTTPClient::_create)(bool p_notify_postinitialize) = HTTPClientTCP::_create_func;
 
 #endif // WEB_ENABLED
diff --git a/core/io/http_client_tcp.h b/core/io/http_client_tcp.h
index 6060c975bcb..dd6cc6b84f0 100644
--- a/core/io/http_client_tcp.h
+++ b/core/io/http_client_tcp.h
@@ -76,7 +76,7 @@ private:
 	Error _get_http_data(uint8_t *p_buffer, int p_bytes, int &r_received);
 
 public:
-	static HTTPClient *_create_func();
+	static HTTPClient *_create_func(bool p_notify_postinitialize);
 
 	Error request(Method p_method, const String &p_url, const Vector<String> &p_headers, const uint8_t *p_body, int p_body_size) override;
 
diff --git a/core/io/packet_peer_dtls.cpp b/core/io/packet_peer_dtls.cpp
index 18bef3ff3cc..231c48d8876 100644
--- a/core/io/packet_peer_dtls.cpp
+++ b/core/io/packet_peer_dtls.cpp
@@ -32,12 +32,12 @@
 #include "core/config/project_settings.h"
 #include "core/io/file_access.h"
 
-PacketPeerDTLS *(*PacketPeerDTLS::_create)() = nullptr;
+PacketPeerDTLS *(*PacketPeerDTLS::_create)(bool p_notify_postinitialize) = nullptr;
 bool PacketPeerDTLS::available = false;
 
-PacketPeerDTLS *PacketPeerDTLS::create() {
+PacketPeerDTLS *PacketPeerDTLS::create(bool p_notify_postinitialize) {
 	if (_create) {
-		return _create();
+		return _create(p_notify_postinitialize);
 	}
 	return nullptr;
 }
diff --git a/core/io/packet_peer_dtls.h b/core/io/packet_peer_dtls.h
index 3990a851f74..03d97a59036 100644
--- a/core/io/packet_peer_dtls.h
+++ b/core/io/packet_peer_dtls.h
@@ -38,7 +38,7 @@ class PacketPeerDTLS : public PacketPeer {
 	GDCLASS(PacketPeerDTLS, PacketPeer);
 
 protected:
-	static PacketPeerDTLS *(*_create)();
+	static PacketPeerDTLS *(*_create)(bool p_notify_postinitialize);
 	static void _bind_methods();
 
 	static bool available;
@@ -57,7 +57,7 @@ public:
 	virtual void disconnect_from_peer() = 0;
 	virtual Status get_status() const = 0;
 
-	static PacketPeerDTLS *create();
+	static PacketPeerDTLS *create(bool p_notify_postinitialize = true);
 	static bool is_available();
 
 	PacketPeerDTLS() {}
diff --git a/core/io/stream_peer_tls.cpp b/core/io/stream_peer_tls.cpp
index 69877974e68..f04e217a266 100644
--- a/core/io/stream_peer_tls.cpp
+++ b/core/io/stream_peer_tls.cpp
@@ -32,11 +32,11 @@
 
 #include "core/config/engine.h"
 
-StreamPeerTLS *(*StreamPeerTLS::_create)() = nullptr;
+StreamPeerTLS *(*StreamPeerTLS::_create)(bool p_notify_postinitialize) = nullptr;
 
-StreamPeerTLS *StreamPeerTLS::create() {
+StreamPeerTLS *StreamPeerTLS::create(bool p_notify_postinitialize) {
 	if (_create) {
-		return _create();
+		return _create(p_notify_postinitialize);
 	}
 	return nullptr;
 }
diff --git a/core/io/stream_peer_tls.h b/core/io/stream_peer_tls.h
index 5894abb7a46..3e03e25a2d4 100644
--- a/core/io/stream_peer_tls.h
+++ b/core/io/stream_peer_tls.h
@@ -38,7 +38,7 @@ class StreamPeerTLS : public StreamPeer {
 	GDCLASS(StreamPeerTLS, StreamPeer);
 
 protected:
-	static StreamPeerTLS *(*_create)();
+	static StreamPeerTLS *(*_create)(bool p_notify_postinitialize);
 	static void _bind_methods();
 
 public:
@@ -58,7 +58,7 @@ public:
 
 	virtual void disconnect_from_stream() = 0;
 
-	static StreamPeerTLS *create();
+	static StreamPeerTLS *create(bool p_notify_postinitialize = true);
 
 	static bool is_available();
 
diff --git a/core/object/class_db.cpp b/core/object/class_db.cpp
index ceeb04b8eae..94285add961 100644
--- a/core/object/class_db.cpp
+++ b/core/object/class_db.cpp
@@ -181,7 +181,7 @@ public:
 		return 0;
 	}
 
-	static GDExtensionObjectPtr placeholder_class_create_instance(void *p_class_userdata) {
+	static GDExtensionObjectPtr placeholder_class_create_instance(void *p_class_userdata, bool p_notify_postinitialize) {
 		ClassDB::ClassInfo *ti = (ClassDB::ClassInfo *)p_class_userdata;
 
 		// Find the closest native parent, that isn't a runtime class.
@@ -192,7 +192,7 @@ public:
 		ERR_FAIL_NULL_V(native_parent->creation_func, nullptr);
 
 		// Construct a placeholder.
-		Object *obj = native_parent->creation_func();
+		Object *obj = native_parent->creation_func(p_notify_postinitialize);
 
 		// ClassDB::set_object_extension_instance() won't be called for placeholders.
 		// We need need to make sure that all the things it would have done (even if
@@ -502,12 +502,12 @@ StringName ClassDB::get_compatibility_class(const StringName &p_class) {
 	return StringName();
 }
 
-Object *ClassDB::_instantiate_internal(const StringName &p_class, bool p_require_real_class) {
+Object *ClassDB::_instantiate_internal(const StringName &p_class, bool p_require_real_class, bool p_notify_postinitialize) {
 	ClassInfo *ti;
 	{
 		OBJTYPE_RLOCK;
 		ti = classes.getptr(p_class);
-		if (!ti || ti->disabled || !ti->creation_func || (ti->gdextension && !ti->gdextension->create_instance)) {
+		if (!_can_instantiate(ti)) {
 			if (compat_classes.has(p_class)) {
 				ti = classes.getptr(compat_classes[p_class]);
 			}
@@ -516,34 +516,78 @@ Object *ClassDB::_instantiate_internal(const StringName &p_class, bool p_require
 		ERR_FAIL_COND_V_MSG(ti->disabled, nullptr, "Class '" + String(p_class) + "' is disabled.");
 		ERR_FAIL_NULL_V_MSG(ti->creation_func, nullptr, "Class '" + String(p_class) + "' or its base class cannot be instantiated.");
 	}
+
 #ifdef TOOLS_ENABLED
 	if ((ti->api == API_EDITOR || ti->api == API_EDITOR_EXTENSION) && !Engine::get_singleton()->is_editor_hint()) {
 		ERR_PRINT("Class '" + String(p_class) + "' can only be instantiated by editor.");
 		return nullptr;
 	}
 #endif
-	if (ti->gdextension && ti->gdextension->create_instance) {
-		ObjectGDExtension *extension = ti->gdextension;
-#ifdef TOOLS_ENABLED
-		if (!p_require_real_class && ti->is_runtime && Engine::get_singleton()->is_editor_hint()) {
-			extension = get_placeholder_extension(ti->name);
-		}
-#endif
-		return (Object *)extension->create_instance(extension->class_userdata);
-	} else {
-#ifdef TOOLS_ENABLED
-		if (!p_require_real_class && ti->is_runtime && Engine::get_singleton()->is_editor_hint()) {
-			if (!ti->inherits_ptr || !ti->inherits_ptr->creation_func) {
-				ERR_PRINT(vformat("Cannot make a placeholder instance of runtime class %s because its parent cannot be constructed.", ti->name));
-			} else {
-				ObjectGDExtension *extension = get_placeholder_extension(ti->name);
-				return (Object *)extension->create_instance(extension->class_userdata);
-			}
-		}
-#endif
 
-		return ti->creation_func();
+#ifdef TOOLS_ENABLED
+	// Try to create placeholder.
+	if (!p_require_real_class && ti->is_runtime && Engine::get_singleton()->is_editor_hint()) {
+		bool can_create_placeholder = false;
+		if (ti->gdextension) {
+			if (ti->gdextension->create_instance2) {
+				can_create_placeholder = true;
+			}
+#ifndef DISABLE_DEPRECATED
+			else if (ti->gdextension->create_instance) {
+				can_create_placeholder = true;
+			}
+#endif // DISABLE_DEPRECATED
+		} else if (!ti->inherits_ptr || !ti->inherits_ptr->creation_func) {
+			ERR_PRINT(vformat("Cannot make a placeholder instance of runtime class %s because its parent cannot be constructed.", ti->name));
+		} else {
+			can_create_placeholder = true;
+		}
+
+		if (can_create_placeholder) {
+			ObjectGDExtension *extension = get_placeholder_extension(ti->name);
+			return (Object *)extension->create_instance2(extension->class_userdata, p_notify_postinitialize);
+		}
 	}
+#endif // TOOLS_ENABLED
+
+	if (ti->gdextension && ti->gdextension->create_instance2) {
+		ObjectGDExtension *extension = ti->gdextension;
+		return (Object *)extension->create_instance2(extension->class_userdata, p_notify_postinitialize);
+	}
+#ifndef DISABLE_DEPRECATED
+	else if (ti->gdextension && ti->gdextension->create_instance) {
+		ObjectGDExtension *extension = ti->gdextension;
+		return (Object *)extension->create_instance(extension->class_userdata);
+	}
+#endif // DISABLE_DEPRECATED
+	else {
+		return ti->creation_func(p_notify_postinitialize);
+	}
+}
+
+bool ClassDB::_can_instantiate(ClassInfo *p_class_info) {
+	if (!p_class_info) {
+		return false;
+	}
+
+	if (p_class_info->disabled || !p_class_info->creation_func) {
+		return false;
+	}
+
+	if (!p_class_info->gdextension) {
+		return true;
+	}
+
+	if (p_class_info->gdextension->create_instance2) {
+		return true;
+	}
+
+#ifndef DISABLE_DEPRECATED
+	if (p_class_info->gdextension->create_instance) {
+		return true;
+	}
+#endif //  DISABLE_DEPRECATED
+	return false;
 }
 
 Object *ClassDB::instantiate(const StringName &p_class) {
@@ -554,6 +598,10 @@ Object *ClassDB::instantiate_no_placeholders(const StringName &p_class) {
 	return _instantiate_internal(p_class, true);
 }
 
+Object *ClassDB::instantiate_without_postinitialization(const StringName &p_class) {
+	return _instantiate_internal(p_class, true, false);
+}
+
 #ifdef TOOLS_ENABLED
 ObjectGDExtension *ClassDB::get_placeholder_extension(const StringName &p_class) {
 	ObjectGDExtension *placeholder_extension = placeholder_extensions.getptr(p_class);
@@ -565,7 +613,7 @@ ObjectGDExtension *ClassDB::get_placeholder_extension(const StringName &p_class)
 	{
 		OBJTYPE_RLOCK;
 		ti = classes.getptr(p_class);
-		if (!ti || ti->disabled || !ti->creation_func || (ti->gdextension && !ti->gdextension->create_instance)) {
+		if (!_can_instantiate(ti)) {
 			if (compat_classes.has(p_class)) {
 				ti = classes.getptr(compat_classes[p_class]);
 			}
@@ -626,7 +674,10 @@ ObjectGDExtension *ClassDB::get_placeholder_extension(const StringName &p_class)
 	placeholder_extension->get_rid = &PlaceholderExtensionInstance::placeholder_instance_get_rid;
 
 	placeholder_extension->class_userdata = ti;
-	placeholder_extension->create_instance = &PlaceholderExtensionInstance::placeholder_class_create_instance;
+#ifndef DISABLE_DEPRECATED
+	placeholder_extension->create_instance = nullptr;
+#endif // DISABLE_DEPRECATED
+	placeholder_extension->create_instance2 = &PlaceholderExtensionInstance::placeholder_class_create_instance;
 	placeholder_extension->free_instance = &PlaceholderExtensionInstance::placeholder_class_free_instance;
 	placeholder_extension->get_virtual = &PlaceholderExtensionInstance::placeholder_class_get_virtual;
 	placeholder_extension->get_virtual_call_data = nullptr;
@@ -643,7 +694,7 @@ void ClassDB::set_object_extension_instance(Object *p_object, const StringName &
 	{
 		OBJTYPE_RLOCK;
 		ti = classes.getptr(p_class);
-		if (!ti || ti->disabled || !ti->creation_func || (ti->gdextension && !ti->gdextension->create_instance)) {
+		if (!_can_instantiate(ti)) {
 			if (compat_classes.has(p_class)) {
 				ti = classes.getptr(compat_classes[p_class]);
 			}
@@ -680,7 +731,7 @@ bool ClassDB::can_instantiate(const StringName &p_class) {
 		return false;
 	}
 #endif
-	return (!ti->disabled && ti->creation_func != nullptr && !(ti->gdextension && !ti->gdextension->create_instance));
+	return _can_instantiate(ti);
 }
 
 bool ClassDB::is_abstract(const StringName &p_class) {
@@ -695,7 +746,18 @@ bool ClassDB::is_abstract(const StringName &p_class) {
 		Ref<Script> scr = ResourceLoader::load(path);
 		return scr.is_valid() && scr->is_valid() && scr->is_abstract();
 	}
-	return ti->creation_func == nullptr && (!ti->gdextension || ti->gdextension->create_instance == nullptr);
+
+	if (ti->creation_func != nullptr) {
+		return false;
+	}
+	if (!ti->gdextension) {
+		return true;
+	}
+#ifndef DISABLE_DEPRECATED
+	return ti->gdextension->create_instance2 == nullptr && ti->gdextension->create_instance == nullptr;
+#else
+	return ti->gdextension->create_instance2 == nullptr;
+#endif //  DISABLE_DEPRECATED
 }
 
 bool ClassDB::is_virtual(const StringName &p_class) {
@@ -715,7 +777,7 @@ bool ClassDB::is_virtual(const StringName &p_class) {
 		return false;
 	}
 #endif
-	return (!ti->disabled && ti->creation_func != nullptr && !(ti->gdextension && !ti->gdextension->create_instance) && ti->is_virtual);
+	return (_can_instantiate(ti) && ti->is_virtual);
 }
 
 void ClassDB::_add_class2(const StringName &p_class, const StringName &p_inherits) {
diff --git a/core/object/class_db.h b/core/object/class_db.h
index 228b82b588c..68f3f4550bf 100644
--- a/core/object/class_db.h
+++ b/core/object/class_db.h
@@ -134,15 +134,21 @@ public:
 		bool reloadable = false;
 		bool is_virtual = false;
 		bool is_runtime = false;
-		Object *(*creation_func)() = nullptr;
+		// The bool argument indicates the need to postinitialize.
+		Object *(*creation_func)(bool) = nullptr;
 
 		ClassInfo() {}
 		~ClassInfo() {}
 	};
 
 	template <typename T>
-	static Object *creator() {
-		return memnew(T);
+	static Object *creator(bool p_notify_postinitialize) {
+		Object *ret = new ("") T;
+		ret->_initialize();
+		if (p_notify_postinitialize) {
+			ret->_postinitialize();
+		}
+		return ret;
 	}
 
 	static RWLock lock;
@@ -183,7 +189,9 @@ private:
 	static MethodBind *_bind_vararg_method(MethodBind *p_bind, const StringName &p_name, const Vector<Variant> &p_default_args, bool p_compatibility);
 	static void _bind_method_custom(const StringName &p_class, MethodBind *p_method, bool p_compatibility);
 
-	static Object *_instantiate_internal(const StringName &p_class, bool p_require_real_class = false);
+	static Object *_instantiate_internal(const StringName &p_class, bool p_require_real_class = false, bool p_notify_postinitialize = true);
+
+	static bool _can_instantiate(ClassInfo *p_class_info);
 
 public:
 	// DO NOT USE THIS!!!!!! NEEDS TO BE PUBLIC BUT DO NOT USE NO MATTER WHAT!!!
@@ -256,8 +264,8 @@ public:
 	static void unregister_extension_class(const StringName &p_class, bool p_free_method_binds = true);
 
 	template <typename T>
-	static Object *_create_ptr_func() {
-		return T::create();
+	static Object *_create_ptr_func(bool p_notify_postinitialize) {
+		return T::create(p_notify_postinitialize);
 	}
 
 	template <typename T>
@@ -291,6 +299,7 @@ public:
 	static bool is_virtual(const StringName &p_class);
 	static Object *instantiate(const StringName &p_class);
 	static Object *instantiate_no_placeholders(const StringName &p_class);
+	static Object *instantiate_without_postinitialization(const StringName &p_class);
 	static void set_object_extension_instance(Object *p_object, const StringName &p_class, GDExtensionClassInstancePtr p_instance);
 
 	static APIType get_api_type(const StringName &p_class);
diff --git a/core/object/object.cpp b/core/object/object.cpp
index a2926a478d7..161b1e3dbee 100644
--- a/core/object/object.cpp
+++ b/core/object/object.cpp
@@ -207,10 +207,13 @@ void Object::cancel_free() {
 	_predelete_ok = false;
 }
 
-void Object::_postinitialize() {
-	_class_name_ptr = _get_class_namev(); // Set the direct pointer, which is much faster to obtain, but can only happen after postinitialize.
+void Object::_initialize() {
+	_class_name_ptr = _get_class_namev(); // Set the direct pointer, which is much faster to obtain, but can only happen after _initialize.
 	_initialize_classv();
 	_class_name_ptr = nullptr; // May have been called from a constructor.
+}
+
+void Object::_postinitialize() {
 	notification(NOTIFICATION_POSTINITIALIZE);
 }
 
@@ -2129,6 +2132,7 @@ bool predelete_handler(Object *p_object) {
 }
 
 void postinitialize_handler(Object *p_object) {
+	p_object->_initialize();
 	p_object->_postinitialize();
 }
 
diff --git a/core/object/object.h b/core/object/object.h
index adb50268d2a..7307b7ede07 100644
--- a/core/object/object.h
+++ b/core/object/object.h
@@ -350,7 +350,10 @@ struct ObjectGDExtension {
 	}
 	void *class_userdata = nullptr;
 
+#ifndef DISABLE_DEPRECATED
 	GDExtensionClassCreateInstance create_instance;
+#endif // DISABLE_DEPRECATED
+	GDExtensionClassCreateInstance2 create_instance2;
 	GDExtensionClassFreeInstance free_instance;
 	GDExtensionClassGetVirtual get_virtual;
 	GDExtensionClassGetVirtualCallData get_virtual_call_data;
@@ -632,6 +635,7 @@ private:
 	int _predelete_ok = 0;
 	ObjectID _instance_id;
 	bool _predelete();
+	void _initialize();
 	void _postinitialize();
 	bool _can_translate = true;
 	bool _emitting = false;
diff --git a/modules/mbedtls/crypto_mbedtls.cpp b/modules/mbedtls/crypto_mbedtls.cpp
index e910627b324..0d97b5fc1a2 100644
--- a/modules/mbedtls/crypto_mbedtls.cpp
+++ b/modules/mbedtls/crypto_mbedtls.cpp
@@ -49,8 +49,8 @@
 #define PEM_END_CRT "-----END CERTIFICATE-----\n"
 #define PEM_MIN_SIZE 54
 
-CryptoKey *CryptoKeyMbedTLS::create() {
-	return memnew(CryptoKeyMbedTLS);
+CryptoKey *CryptoKeyMbedTLS::create(bool p_notify_postinitialize) {
+	return static_cast<CryptoKey *>(ClassDB::creator<CryptoKeyMbedTLS>(p_notify_postinitialize));
 }
 
 Error CryptoKeyMbedTLS::load(const String &p_path, bool p_public_only) {
@@ -153,8 +153,8 @@ int CryptoKeyMbedTLS::_parse_key(const uint8_t *p_buf, int p_size) {
 #endif
 }
 
-X509Certificate *X509CertificateMbedTLS::create() {
-	return memnew(X509CertificateMbedTLS);
+X509Certificate *X509CertificateMbedTLS::create(bool p_notify_postinitialize) {
+	return static_cast<X509Certificate *>(ClassDB::creator<X509CertificateMbedTLS>(p_notify_postinitialize));
 }
 
 Error X509CertificateMbedTLS::load(const String &p_path) {
@@ -250,8 +250,8 @@ bool HMACContextMbedTLS::is_md_type_allowed(mbedtls_md_type_t p_md_type) {
 	}
 }
 
-HMACContext *HMACContextMbedTLS::create() {
-	return memnew(HMACContextMbedTLS);
+HMACContext *HMACContextMbedTLS::create(bool p_notify_postinitialize) {
+	return static_cast<HMACContext *>(ClassDB::creator<HMACContextMbedTLS>(p_notify_postinitialize));
 }
 
 Error HMACContextMbedTLS::start(HashingContext::HashType p_hash_type, const PackedByteArray &p_key) {
@@ -309,8 +309,8 @@ HMACContextMbedTLS::~HMACContextMbedTLS() {
 	}
 }
 
-Crypto *CryptoMbedTLS::create() {
-	return memnew(CryptoMbedTLS);
+Crypto *CryptoMbedTLS::create(bool p_notify_postinitialize) {
+	return static_cast<Crypto *>(ClassDB::creator<CryptoMbedTLS>(p_notify_postinitialize));
 }
 
 void CryptoMbedTLS::initialize_crypto() {
diff --git a/modules/mbedtls/crypto_mbedtls.h b/modules/mbedtls/crypto_mbedtls.h
index 52918cedf03..5e1da550d77 100644
--- a/modules/mbedtls/crypto_mbedtls.h
+++ b/modules/mbedtls/crypto_mbedtls.h
@@ -49,7 +49,7 @@ private:
 	int _parse_key(const uint8_t *p_buf, int p_size);
 
 public:
-	static CryptoKey *create();
+	static CryptoKey *create(bool p_notify_postinitialize = true);
 	static void make_default() { CryptoKey::_create = create; }
 	static void finalize() { CryptoKey::_create = nullptr; }
 
@@ -80,7 +80,7 @@ private:
 	int locks;
 
 public:
-	static X509Certificate *create();
+	static X509Certificate *create(bool p_notify_postinitialize = true);
 	static void make_default() { X509Certificate::_create = create; }
 	static void finalize() { X509Certificate::_create = nullptr; }
 
@@ -112,7 +112,7 @@ private:
 	void *ctx = nullptr;
 
 public:
-	static HMACContext *create();
+	static HMACContext *create(bool p_notify_postinitialize = true);
 	static void make_default() { HMACContext::_create = create; }
 	static void finalize() { HMACContext::_create = nullptr; }
 
@@ -133,7 +133,7 @@ private:
 	static X509CertificateMbedTLS *default_certs;
 
 public:
-	static Crypto *create();
+	static Crypto *create(bool p_notify_postinitialize = true);
 	static void initialize_crypto();
 	static void finalize_crypto();
 	static X509CertificateMbedTLS *get_default_certificates();
diff --git a/modules/mbedtls/dtls_server_mbedtls.cpp b/modules/mbedtls/dtls_server_mbedtls.cpp
index e466fe15d6d..b64bdcb1921 100644
--- a/modules/mbedtls/dtls_server_mbedtls.cpp
+++ b/modules/mbedtls/dtls_server_mbedtls.cpp
@@ -54,8 +54,8 @@ Ref<PacketPeerDTLS> DTLSServerMbedTLS::take_connection(Ref<PacketPeerUDP> p_udp_
 	return out;
 }
 
-DTLSServer *DTLSServerMbedTLS::_create_func() {
-	return memnew(DTLSServerMbedTLS);
+DTLSServer *DTLSServerMbedTLS::_create_func(bool p_notify_postinitialize) {
+	return static_cast<DTLSServer *>(ClassDB::creator<DTLSServerMbedTLS>(p_notify_postinitialize));
 }
 
 void DTLSServerMbedTLS::initialize() {
diff --git a/modules/mbedtls/dtls_server_mbedtls.h b/modules/mbedtls/dtls_server_mbedtls.h
index 59befecf437..18661bf5055 100644
--- a/modules/mbedtls/dtls_server_mbedtls.h
+++ b/modules/mbedtls/dtls_server_mbedtls.h
@@ -37,7 +37,7 @@
 
 class DTLSServerMbedTLS : public DTLSServer {
 private:
-	static DTLSServer *_create_func();
+	static DTLSServer *_create_func(bool p_notify_postinitialize);
 	Ref<TLSOptions> tls_options;
 	Ref<CookieContextMbedTLS> cookies;
 
diff --git a/modules/mbedtls/packet_peer_mbed_dtls.cpp b/modules/mbedtls/packet_peer_mbed_dtls.cpp
index c7373481ca0..62d27405d87 100644
--- a/modules/mbedtls/packet_peer_mbed_dtls.cpp
+++ b/modules/mbedtls/packet_peer_mbed_dtls.cpp
@@ -270,8 +270,8 @@ PacketPeerMbedDTLS::Status PacketPeerMbedDTLS::get_status() const {
 	return status;
 }
 
-PacketPeerDTLS *PacketPeerMbedDTLS::_create_func() {
-	return memnew(PacketPeerMbedDTLS);
+PacketPeerDTLS *PacketPeerMbedDTLS::_create_func(bool p_notify_postinitialize) {
+	return static_cast<PacketPeerDTLS *>(ClassDB::creator<PacketPeerMbedDTLS>(p_notify_postinitialize));
 }
 
 void PacketPeerMbedDTLS::initialize_dtls() {
diff --git a/modules/mbedtls/packet_peer_mbed_dtls.h b/modules/mbedtls/packet_peer_mbed_dtls.h
index 2cff7a3589a..881a5fdd0e4 100644
--- a/modules/mbedtls/packet_peer_mbed_dtls.h
+++ b/modules/mbedtls/packet_peer_mbed_dtls.h
@@ -50,7 +50,7 @@ private:
 
 	Ref<PacketPeerUDP> base;
 
-	static PacketPeerDTLS *_create_func();
+	static PacketPeerDTLS *_create_func(bool p_notify_postinitialize);
 
 	static int bio_recv(void *ctx, unsigned char *buf, size_t len);
 	static int bio_send(void *ctx, const unsigned char *buf, size_t len);
diff --git a/modules/mbedtls/stream_peer_mbedtls.cpp b/modules/mbedtls/stream_peer_mbedtls.cpp
index a359b420411..b4200410fb1 100644
--- a/modules/mbedtls/stream_peer_mbedtls.cpp
+++ b/modules/mbedtls/stream_peer_mbedtls.cpp
@@ -295,8 +295,8 @@ Ref<StreamPeer> StreamPeerMbedTLS::get_stream() const {
 	return base;
 }
 
-StreamPeerTLS *StreamPeerMbedTLS::_create_func() {
-	return memnew(StreamPeerMbedTLS);
+StreamPeerTLS *StreamPeerMbedTLS::_create_func(bool p_notify_postinitialize) {
+	return static_cast<StreamPeerTLS *>(ClassDB::creator<StreamPeerMbedTLS>(p_notify_postinitialize));
 }
 
 void StreamPeerMbedTLS::initialize_tls() {
diff --git a/modules/mbedtls/stream_peer_mbedtls.h b/modules/mbedtls/stream_peer_mbedtls.h
index a8080f0960a..b4f80b614c6 100644
--- a/modules/mbedtls/stream_peer_mbedtls.h
+++ b/modules/mbedtls/stream_peer_mbedtls.h
@@ -42,7 +42,7 @@ private:
 
 	Ref<StreamPeer> base;
 
-	static StreamPeerTLS *_create_func();
+	static StreamPeerTLS *_create_func(bool p_notify_postinitialize);
 
 	static int bio_recv(void *ctx, unsigned char *buf, size_t len);
 	static int bio_send(void *ctx, const unsigned char *buf, size_t len);
diff --git a/modules/mono/editor/bindings_generator.cpp b/modules/mono/editor/bindings_generator.cpp
index 9a76a256395..b26f6d1bbf9 100644
--- a/modules/mono/editor/bindings_generator.cpp
+++ b/modules/mono/editor/bindings_generator.cpp
@@ -2184,7 +2184,7 @@ Error BindingsGenerator::_generate_cs_type(const TypeInterface &itype, const Str
 			// Add native constructor static field
 
 			output << MEMBER_BEGIN << "[DebuggerBrowsable(DebuggerBrowsableState.Never)]\n"
-				   << INDENT1 "private static readonly unsafe delegate* unmanaged<IntPtr> "
+				   << INDENT1 "private static readonly unsafe delegate* unmanaged<godot_bool, IntPtr> "
 				   << CS_STATIC_FIELD_NATIVE_CTOR " = " ICALL_CLASSDB_GET_CONSTRUCTOR
 				   << "(" BINDINGS_NATIVE_NAME_FIELD ");\n";
 		}
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/GodotObject.base.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/GodotObject.base.cs
index 0be9cdc953b..c094eaed778 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/GodotObject.base.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/GodotObject.base.cs
@@ -30,7 +30,7 @@ namespace Godot
         }
 
         internal unsafe void ConstructAndInitialize(
-            delegate* unmanaged<IntPtr> nativeCtor,
+            delegate* unmanaged<godot_bool, IntPtr> nativeCtor,
             StringName nativeName,
             Type cachedType,
             bool refCounted
@@ -40,7 +40,8 @@ namespace Godot
             {
                 Debug.Assert(nativeCtor != null);
 
-                NativePtr = nativeCtor();
+                // Need postinitialization.
+                NativePtr = nativeCtor(godot_bool.True);
 
                 InteropUtils.TieManagedToUnmanaged(this, NativePtr,
                     nativeName, refCounted, GetType(), cachedType);
@@ -260,7 +261,7 @@ namespace Godot
             return methodBind;
         }
 
-        internal static unsafe delegate* unmanaged<IntPtr> ClassDB_get_constructor(StringName type)
+        internal static unsafe delegate* unmanaged<godot_bool, IntPtr> ClassDB_get_constructor(StringName type)
         {
             // for some reason the '??' operator doesn't support 'delegate*'
             var typeSelf = (godot_string_name)type.NativeValue;
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/NativeInterop/NativeFuncs.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/NativeInterop/NativeFuncs.cs
index cfd9ed7acc2..6a643833f6a 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/NativeInterop/NativeFuncs.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/NativeInterop/NativeFuncs.cs
@@ -47,7 +47,7 @@ namespace Godot.NativeInterop
         public static partial IntPtr godotsharp_method_bind_get_method_with_compatibility(
             in godot_string_name p_classname, in godot_string_name p_methodname, ulong p_hash);
 
-        public static partial delegate* unmanaged<IntPtr> godotsharp_get_class_constructor(
+        public static partial delegate* unmanaged<godot_bool, IntPtr> godotsharp_get_class_constructor(
             in godot_string_name p_classname);
 
         public static partial IntPtr godotsharp_engine_get_singleton(in godot_string p_name);
diff --git a/modules/mono/glue/runtime_interop.cpp b/modules/mono/glue/runtime_interop.cpp
index 80e9fdf77f5..73c10eba830 100644
--- a/modules/mono/glue/runtime_interop.cpp
+++ b/modules/mono/glue/runtime_interop.cpp
@@ -58,7 +58,7 @@ extern "C" {
 // For ArrayPrivate and DictionaryPrivate
 static_assert(sizeof(SafeRefCount) == sizeof(uint32_t));
 
-typedef Object *(*godotsharp_class_creation_func)();
+typedef Object *(*godotsharp_class_creation_func)(bool);
 
 bool godotsharp_dotnet_module_is_initialized() {
 	return GDMono::get_singleton()->is_initialized();
diff --git a/modules/webrtc/webrtc_peer_connection.cpp b/modules/webrtc/webrtc_peer_connection.cpp
index 0a50b677c46..69be873fcf3 100644
--- a/modules/webrtc/webrtc_peer_connection.cpp
+++ b/modules/webrtc/webrtc_peer_connection.cpp
@@ -43,15 +43,20 @@ void WebRTCPeerConnection::set_default_extension(const StringName &p_extension)
 	default_extension = StringName(p_extension, true);
 }
 
-WebRTCPeerConnection *WebRTCPeerConnection::create() {
+WebRTCPeerConnection *WebRTCPeerConnection::create(bool p_notify_postinitialize) {
 #ifdef WEB_ENABLED
-	return memnew(WebRTCPeerConnectionJS);
+	return static_cast<WebRTCPeerConnection *>(ClassDB::creator<WebRTCPeerConnectionJS>(p_notify_postinitialize));
 #else
 	if (default_extension == StringName()) {
 		WARN_PRINT_ONCE("No default WebRTC extension configured.");
-		return memnew(WebRTCPeerConnectionExtension);
+		return static_cast<WebRTCPeerConnection *>(ClassDB::creator<WebRTCPeerConnectionExtension>(p_notify_postinitialize));
+	}
+	Object *obj = nullptr;
+	if (p_notify_postinitialize) {
+		obj = ClassDB::instantiate(default_extension);
+	} else {
+		obj = ClassDB::instantiate_without_postinitialization(default_extension);
 	}
-	Object *obj = ClassDB::instantiate(default_extension);
 	return Object::cast_to<WebRTCPeerConnectionExtension>(obj);
 #endif
 }
diff --git a/modules/webrtc/webrtc_peer_connection.h b/modules/webrtc/webrtc_peer_connection.h
index 0f79c17519b..33c95ccd0f7 100644
--- a/modules/webrtc/webrtc_peer_connection.h
+++ b/modules/webrtc/webrtc_peer_connection.h
@@ -85,7 +85,7 @@ public:
 	virtual Error poll() = 0;
 	virtual void close() = 0;
 
-	static WebRTCPeerConnection *create();
+	static WebRTCPeerConnection *create(bool p_notify_postinitialize = true);
 
 	WebRTCPeerConnection();
 	~WebRTCPeerConnection();
diff --git a/modules/websocket/emws_peer.h b/modules/websocket/emws_peer.h
index 38f15c82e54..fe0bc594e63 100644
--- a/modules/websocket/emws_peer.h
+++ b/modules/websocket/emws_peer.h
@@ -68,7 +68,7 @@ private:
 	String selected_protocol;
 	String requested_url;
 
-	static WebSocketPeer *_create() { return memnew(EMWSPeer); }
+	static WebSocketPeer *_create(bool p_notify_postinitialize) { return static_cast<WebSocketPeer *>(ClassDB::creator<EMWSPeer>(p_notify_postinitialize)); }
 	static void _esws_on_connect(void *obj, char *proto);
 	static void _esws_on_message(void *obj, const uint8_t *p_data, int p_data_size, int p_is_string);
 	static void _esws_on_error(void *obj);
diff --git a/modules/websocket/websocket_peer.cpp b/modules/websocket/websocket_peer.cpp
index 3c0d316bc9d..95a1a238e95 100644
--- a/modules/websocket/websocket_peer.cpp
+++ b/modules/websocket/websocket_peer.cpp
@@ -30,7 +30,7 @@
 
 #include "websocket_peer.h"
 
-WebSocketPeer *(*WebSocketPeer::_create)() = nullptr;
+WebSocketPeer *(*WebSocketPeer::_create)(bool p_notify_postinitialize) = nullptr;
 
 WebSocketPeer::WebSocketPeer() {
 }
diff --git a/modules/websocket/websocket_peer.h b/modules/websocket/websocket_peer.h
index 3110e87071c..ef0197cf6c9 100644
--- a/modules/websocket/websocket_peer.h
+++ b/modules/websocket/websocket_peer.h
@@ -59,7 +59,7 @@ private:
 	virtual Error _send_bind(const PackedByteArray &p_data, WriteMode p_mode = WRITE_MODE_BINARY);
 
 protected:
-	static WebSocketPeer *(*_create)();
+	static WebSocketPeer *(*_create)(bool p_notify_postinitialize);
 
 	static void _bind_methods();
 
@@ -74,11 +74,11 @@ protected:
 	int max_queued_packets = 2048;
 
 public:
-	static WebSocketPeer *create() {
+	static WebSocketPeer *create(bool p_notify_postinitialize = true) {
 		if (!_create) {
 			return nullptr;
 		}
-		return _create();
+		return _create(p_notify_postinitialize);
 	}
 
 	virtual Error connect_to_url(const String &p_url, Ref<TLSOptions> p_options = Ref<TLSOptions>()) = 0;
diff --git a/modules/websocket/wsl_peer.h b/modules/websocket/wsl_peer.h
index bf9f5c85273..fb01da7ce29 100644
--- a/modules/websocket/wsl_peer.h
+++ b/modules/websocket/wsl_peer.h
@@ -49,7 +49,7 @@
 class WSLPeer : public WebSocketPeer {
 private:
 	static CryptoCore::RandomGenerator *_static_rng;
-	static WebSocketPeer *_create() { return memnew(WSLPeer); }
+	static WebSocketPeer *_create(bool p_notify_postinitialize) { return static_cast<WebSocketPeer *>(ClassDB::creator<WSLPeer>(p_notify_postinitialize)); }
 
 	// Callbacks.
 	static ssize_t _wsl_recv_callback(wslay_event_context_ptr ctx, uint8_t *data, size_t len, int flags, void *user_data);
diff --git a/platform/web/http_client_web.cpp b/platform/web/http_client_web.cpp
index ea9226a5a48..80257dc2954 100644
--- a/platform/web/http_client_web.cpp
+++ b/platform/web/http_client_web.cpp
@@ -266,11 +266,11 @@ Error HTTPClientWeb::poll() {
 	return OK;
 }
 
-HTTPClient *HTTPClientWeb::_create_func() {
-	return memnew(HTTPClientWeb);
+HTTPClient *HTTPClientWeb::_create_func(bool p_notify_postinitialize) {
+	return static_cast<HTTPClient *>(ClassDB::creator<HTTPClientWeb>(p_notify_postinitialize));
 }
 
-HTTPClient *(*HTTPClient::_create)() = HTTPClientWeb::_create_func;
+HTTPClient *(*HTTPClient::_create)(bool p_notify_postinitialize) = HTTPClientWeb::_create_func;
 
 HTTPClientWeb::HTTPClientWeb() {
 }
diff --git a/platform/web/http_client_web.h b/platform/web/http_client_web.h
index 4d3c457a7d0..f696c5a5b0a 100644
--- a/platform/web/http_client_web.h
+++ b/platform/web/http_client_web.h
@@ -81,7 +81,7 @@ private:
 	static void _parse_headers(int p_len, const char **p_headers, void *p_ref);
 
 public:
-	static HTTPClient *_create_func();
+	static HTTPClient *_create_func(bool p_notify_postinitialize);
 
 	Error request(Method p_method, const String &p_url, const Vector<String> &p_headers, const uint8_t *p_body, int p_body_size) override;