### Godot version

v4.0.stable.official [92bee43ad]

### System information

Windows 10, 64bit

### Issue description

First, please run the reproduction project.
When I run the test scene, It report error like follow and app exited. 
![image](https://user-images.githubusercontent.com/35988767/229076194-f737bcb6-6c9b-4aa0-9bd5-3dbd36bc8d03.png)
And I don't know where was error.



### Steps to reproduce

1. Open the reproduction project.
2. Open scene 'user:\\xd\XActors\Weapon\Gun\Rifle\XRifle.tscn'
3. Assign the scene's Meshinstance's mesh with 'user:\\xd\XActors\Weapon\Gun\Rifle\XRifle01.res'
4. Run the scene
Opps, the scene exited.
![GIF](https://user-images.githubusercontent.com/35988767/229077075-4b18b9e0-933e-47f6-b6a8-0af966574884.gif)


### Minimal reproduction project

[GlbTest.zip](https://github.com/godotengine/godot/files/11120181/GlbTest.zip)

NOTE: The project that I provided was picked up from my owner project. Sorry I can't provide a minimal reproduction project because I don't know which step cause this issue. I was test like this:
Create a project, import the glb file, create meshinstance and assign mesh, but there was not error!

continue;
		}
		for (int i = 0; i < ScriptServer::get_language_count(); i++) {
			ScriptLanguage *lang = ScriptServer::get_language(i);
			if (lang->supports_documentation() && efd->files[index]->type == lang->get_type()) {
				Ref<Script> scr = ResourceLoader::load(path);
				if (scr.is_null()) {
					continue;
				}
				Vector<DocData::ClassDoc> docs = scr->get_documentation();
				for (int j = 0; j < docs.size(); j++) {
					EditorHelp::get_doc_data()->add_doc(docs[j]);
				}
			}
		}
	}
	update_script_paths.clear();
	update_script_mutex.unlock();
	ScriptServer::save_global_classes();
	EditorNode::get_editor_data().script_class_save_icon_paths();
	emit_signal("script_classes_updated");
	
	
	
	ResourceLoader::remove_custom_loaders();
	ResourceLoader::add_custom_loaders();
	ResourceSaver::remove_custom_savers();
	ResourceSaver::add_custom_savers();
}
void EditorFileSystem::_update_pending_script_classes() {