diff --git a/spine-godot/build/install-macos-vulkan-sdk.sh b/spine-godot/build/install-macos-vulkan-sdk.sh
index 80bbb28e7..8c8a569d3 100755
--- a/spine-godot/build/install-macos-vulkan-sdk.sh
+++ b/spine-godot/build/install-macos-vulkan-sdk.sh
@@ -2,7 +2,7 @@ set -euo pipefail
 IFS=$'\n\t'
 
 # Download and install the Vulkan SDK.
-curl -L "https://sdk.lunarg.com/sdk/download/1.3.268.0/mac/vulkansdk-macos-1.3.268.0.dmg" -o /tmp/vulkan-sdk.dmg
+curl -L "https://sdk.lunarg.com/sdk/download/1.3.275.0/mac/vulkansdk-macos-1.3.275.0.dmg" -o /tmp/vulkan-sdk.dmg
 hdiutil attach /tmp/vulkan-sdk.dmg -mountpoint /Volumes/vulkan-sdk
 /Volumes/vulkan-sdk/InstallVulkan.app/Contents/MacOS/InstallVulkan \
     --accept-licenses --default-answer --confirm-command install
diff --git a/spine-godot/spine_godot/SpineSkeletonDataResource.cpp b/spine-godot/spine_godot/SpineSkeletonDataResource.cpp
index eedd9498a..81a5e51cd 100644
--- a/spine-godot/spine_godot/SpineSkeletonDataResource.cpp
+++ b/spine-godot/spine_godot/SpineSkeletonDataResource.cpp
@@ -233,6 +233,8 @@ SpineSkeletonDataResource::SpineSkeletonDataResource()
 	if (Engine::get_singleton()->is_editor_hint()) {
 		EditorFileSystem *efs = get_editor_file_system();
 		if (efs) {
+			// Store the ObjectID for safe validation in destructor
+			editor_file_system_id = efs->get_instance_id();
 			efs->connect("resources_reimported", callable_mp(this, &SpineSkeletonDataResource::_on_resources_reimported));
 		}
 	}
@@ -240,6 +242,8 @@ SpineSkeletonDataResource::SpineSkeletonDataResource()
 	if (Engine::get_singleton()->is_editor_hint()) {
 		EditorFileSystem *efs = EditorFileSystem::get_singleton();
 		if (efs) {
+			// Store the ObjectID for safe validation in destructor
+			editor_file_system_id = efs->get_instance_id();
 			efs->connect("resources_reimported", this, "_on_resources_reimported");
 		}
 	}
@@ -251,14 +255,14 @@ SpineSkeletonDataResource::~SpineSkeletonDataResource() {
 #ifdef TOOLS_ENABLED
 #if VERSION_MAJOR > 3
 	if (Engine::get_singleton()->is_editor_hint()) {
-		EditorFileSystem *efs = get_editor_file_system();
+		EditorFileSystem *efs = Object::cast_to<EditorFileSystem>(ObjectDB::get_instance(editor_file_system_id));
 		if (efs && efs->is_connected("resources_reimported", callable_mp(this, &SpineSkeletonDataResource::_on_resources_reimported))) {
 			efs->disconnect("resources_reimported", callable_mp(this, &SpineSkeletonDataResource::_on_resources_reimported));
 		}
 	}
 #else
 	if (Engine::get_singleton()->is_editor_hint()) {
-		EditorFileSystem *efs = EditorFileSystem::get_singleton();
+		EditorFileSystem *efs = Object::cast_to<EditorFileSystem>(ObjectDB::get_instance(editor_file_system_id));
 		if (efs && efs->is_connected("resources_reimported", this, "_on_resources_reimported")) {
 			efs->disconnect("resources_reimported", this, "_on_resources_reimported");
 		}
diff --git a/spine-godot/spine_godot/SpineSkeletonDataResource.h b/spine-godot/spine_godot/SpineSkeletonDataResource.h
index 6292e9c8c..f07eff8a1 100644
--- a/spine-godot/spine_godot/SpineSkeletonDataResource.h
+++ b/spine-godot/spine_godot/SpineSkeletonDataResource.h
@@ -82,6 +82,10 @@ private:
 	spine::SkeletonData *skeleton_data;
 	spine::AnimationStateData *animation_state_data;
 
+#ifdef TOOLS_ENABLED
+	ObjectID editor_file_system_id;
+#endif
+
 	void update_skeleton_data();
 
 #ifdef SPINE_GODOT_EXTENSION
diff --git a/spine-godot/spine_godot/SpineSkin.cpp b/spine-godot/spine_godot/SpineSkin.cpp
index 4271f2fe4..32ef1070b 100644
--- a/spine-godot/spine_godot/SpineSkin.cpp
+++ b/spine-godot/spine_godot/SpineSkin.cpp
@@ -45,7 +45,9 @@ void SpineSkin::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_attachments"), &SpineSkin::get_attachments);
 	ClassDB::bind_method(D_METHOD("get_bones"), &SpineSkin::get_bones);
 	ClassDB::bind_method(D_METHOD("get_constraints"), &SpineSkin::get_constraints);
+#if VERSION_MAJOR >= 4
 	ClassDB::bind_method(D_METHOD("init", "name", "sprite"), &SpineSkin::init);
+#endif
 }
 
 SpineSkin::SpineSkin() : owns_skin(false) {
diff --git a/spine-godot/spine_godot/register_types.cpp b/spine-godot/spine_godot/register_types.cpp
index f2c11c1fa..c3eebd6c5 100644
--- a/spine-godot/spine_godot/register_types.cpp
+++ b/spine-godot/spine_godot/register_types.cpp
@@ -88,6 +88,12 @@ void initialize_spine_godot_module(ModuleInitializationLevel level) {
 		EditorPlugins::add_plugin_class(StringName("SpineEditorPlugin"));
 #endif
 	}
+	if (level == MODULE_INITIALIZATION_LEVEL_CORE) {
+		GDREGISTER_CLASS(SpineAtlasResourceFormatLoader);
+		GDREGISTER_CLASS(SpineAtlasResourceFormatSaver);
+		GDREGISTER_CLASS(SpineSkeletonFileResourceFormatLoader);
+		GDREGISTER_CLASS(SpineSkeletonFileResourceFormatSaver);
+	}
 	if (level != MODULE_INITIALIZATION_LEVEL_SCENE) return;
 #else
 #if VERSION_MAJOR > 3
@@ -110,10 +116,12 @@ void register_spine_godot_types() {
 #endif
 	spine::Bone::setYDown(true);
 
+#ifndef SPINE_GODOT_EXTENSION
 	GDREGISTER_CLASS(SpineAtlasResourceFormatLoader);
 	GDREGISTER_CLASS(SpineAtlasResourceFormatSaver);
 	GDREGISTER_CLASS(SpineSkeletonFileResourceFormatLoader);
 	GDREGISTER_CLASS(SpineSkeletonFileResourceFormatSaver);
+#endif
 
 	GDREGISTER_CLASS(SpineObjectWrapper);
 	GDREGISTER_CLASS(SpineAtlasResource);
@@ -223,7 +231,7 @@ extern "C" GDExtensionBool GDE_EXPORT spine_godot_library_init(GDExtensionInterf
 	GDExtensionBinding::InitObject init_obj(p_get_proc_address, p_library, r_initialization);
 	init_obj.register_initializer(initialize_spine_godot_module);
 	init_obj.register_terminator(uninitialize_spine_godot_module);
-	init_obj.set_minimum_library_initialization_level(MODULE_INITIALIZATION_LEVEL_SCENE);
+	init_obj.set_minimum_library_initialization_level(MODULE_INITIALIZATION_LEVEL_CORE);
 	return init_obj.init();
 }
 #endif