diff --git a/core/extension/gdextension.cpp b/core/extension/gdextension.cpp
index 1206a0f20c..86afd86db3 100644
--- a/core/extension/gdextension.cpp
+++ b/core/extension/gdextension.cpp
@@ -240,7 +240,7 @@ 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 GDExtensionClassCreationInfo4 class_info4 = {
+	const GDExtensionClassCreationInfo5 class_info5 = {
 		p_extension_funcs->is_virtual, // GDExtensionBool is_virtual;
 		p_extension_funcs->is_abstract, // GDExtensionBool is_abstract;
 		true, // GDExtensionBool is_exposed;
@@ -274,14 +274,14 @@ void GDExtension::_register_extension_class(GDExtensionClassLibraryPtr p_library
 		p_extension_funcs->get_virtual_func, // GDExtensionClassGetVirtual get_virtual_func;
 		nullptr,
 	};
-	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, &class_info4, &legacy);
+	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, &class_info5, &legacy);
 }
 
 void GDExtension::_register_extension_class2(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo2 *p_extension_funcs) {
-	const GDExtensionClassCreationInfo4 class_info4 = {
+	const GDExtensionClassCreationInfo5 class_info5 = {
 		p_extension_funcs->is_virtual, // GDExtensionBool is_virtual;
 		p_extension_funcs->is_abstract, // GDExtensionBool is_abstract;
-		p_extension_funcs->is_exposed, // GDExtensionBool is_exposed;
+		true, // GDExtensionBool is_exposed;
 		false, // GDExtensionBool is_runtime;
 		nullptr, // GDExtensionConstStringPtr icon_path;
 		p_extension_funcs->set_func, // GDExtensionClassSet set_func;
@@ -312,14 +312,14 @@ void GDExtension::_register_extension_class2(GDExtensionClassLibraryPtr p_librar
 		p_extension_funcs->get_virtual_func, // GDExtensionClassGetVirtual get_virtual_func;
 		p_extension_funcs->get_virtual_call_data_func, // GDExtensionClassGetVirtual get_virtual_func;
 	};
-	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, &class_info4, &legacy);
+	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, &class_info5, &legacy);
 }
 
 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 = {
+	const GDExtensionClassCreationInfo5 class_info5 = {
 		p_extension_funcs->is_virtual, // GDExtensionBool is_virtual;
 		p_extension_funcs->is_abstract, // GDExtensionBool is_abstract;
-		p_extension_funcs->is_exposed, // GDExtensionBool is_exposed;
+		true, // GDExtensionBool is_exposed;
 		p_extension_funcs->is_runtime, // GDExtensionBool is_runtime;
 		nullptr, // GDExtensionConstStringPtr icon_path;
 		p_extension_funcs->set_func, // GDExtensionClassSet set_func;
@@ -350,16 +350,22 @@ void GDExtension::_register_extension_class3(GDExtensionClassLibraryPtr p_librar
 		p_extension_funcs->get_virtual_func, // GDExtensionClassGetVirtual get_virtual_func;
 		p_extension_funcs->get_virtual_call_data_func, // GDExtensionClassGetVirtual get_virtual_func;
 	};
-	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, &class_info4, &legacy);
+	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, &class_info5, &legacy);
 }
 
+void GDExtension::_register_extension_class4(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo4 *p_extension_funcs) {
+	GDExtensionClassCreationInfo5 class_info5 = *p_extension_funcs;
+	// Force classes to be exposed, because the behavior of unexposed classes changed in an incompatible (albeit, minor) way.
+	class_info5.is_exposed = true;
+	_register_extension_class_internal(p_library, p_class_name, p_parent_class_name, &class_info5);
+}
 #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) {
+void GDExtension::_register_extension_class5(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo5 *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 GDExtensionClassCreationInfo4 *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 GDExtensionClassCreationInfo5 *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);
@@ -807,8 +813,9 @@ void GDExtension::initialize_gdextensions() {
 	register_interface_function("classdb_register_extension_class", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class);
 	register_interface_function("classdb_register_extension_class2", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class2);
 	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);
+#endif // DISABLE_DEPRECATED
+	register_interface_function("classdb_register_extension_class5", (GDExtensionInterfaceFunctionPtr)&GDExtension::_register_extension_class5);
 	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 b3426b05b0..1d71060270 100644
--- a/core/extension/gdextension.h
+++ b/core/extension/gdextension.h
@@ -80,9 +80,10 @@ class GDExtension : public Resource {
 	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);
 	static void _register_extension_class3(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo3 *p_extension_funcs);
-#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);
+#endif // DISABLE_DEPRECATED
+	static void _register_extension_class5(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo5 *p_extension_funcs);
+	static void _register_extension_class_internal(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo5 *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.h b/core/extension/gdextension_interface.h
index 34849a6716..0273c80a4a 100644
--- a/core/extension/gdextension_interface.h
+++ b/core/extension/gdextension_interface.h
@@ -399,6 +399,8 @@ typedef struct {
 	void *class_userdata; // Per-class user data, later accessible in instance bindings.
 } GDExtensionClassCreationInfo4;
 
+typedef GDExtensionClassCreationInfo4 GDExtensionClassCreationInfo5;
+
 typedef void *GDExtensionClassLibraryPtr;
 
 /* Passed a pointer to a PackedStringArray that should be filled with the classes that may be used by the GDExtension. */
@@ -2943,6 +2945,7 @@ typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClass3)(GDExtensionCl
 /**
  * @name classdb_register_extension_class4
  * @since 4.4
+ * @deprecated in Godot 4.5. Use `classdb_register_extension_class5` instead.
  *
  * Registers an extension class in the ClassDB.
  *
@@ -2955,6 +2958,21 @@ typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClass3)(GDExtensionCl
  */
 typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClass4)(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo4 *p_extension_funcs);
 
+/**
+ * @name classdb_register_extension_class5
+ * @since 4.5
+ *
+ * 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 (*GDExtensionInterfaceClassdbRegisterExtensionClass5)(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo5 *p_extension_funcs);
+
 /**
  * @name classdb_register_extension_class_method
  * @since 4.1