### 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!

if (!p_dir) {
		return; 
	}
	p_file->store_line("::" + p_dir->get_path() + "::" + String::num(p_dir->modified_time));
	for (int i = 0; i < p_dir->files.size(); i++) {
		if (!p_dir->files[i]->import_group_file.is_empty()) {
			group_file_cache.insert(p_dir->files[i]->import_group_file);
		}
		String type = p_dir->files[i]->type;
		if (p_dir->files[i]->resource_script_class) {
			type += "/" + String(p_dir->files[i]->resource_script_class);
		}
		String s = p_dir->files[i]->file + "::" + type + "::" + itos(p_dir->files[i]->uid) + "::" + itos(p_dir->files[i]->modified_time) + "::" + itos(p_dir->files[i]->import_modified_time) + "::" + itos(p_dir->files[i]->import_valid) + "::" + p_dir->files[i]->import_group_file + "::" + p_dir->files[i]->script_class_name + "<>" + p_dir->files[i]->script_class_extends + "<>" + p_dir->files[i]->script_class_icon_path;
		s += "::";
		for (int j = 0; j < p_dir->files[i]->deps.size(); j++) {
			if (j > 0) {
				s += "<>";
			}
			s += p_dir->files[i]->deps[j];
		}
		p_file->store_line(s);
	}
	for (int i = 0; i < p_dir->subdirs.size(); i++) {
		_save_filesystem_cache(p_dir->subdirs[i], p_file);
	}
}
bool EditorFileSystem::_find_file(const String &p_file, EditorFileSystemDirectory **r_d, int &r_file_pos) const {
	
	if (!filesystem || scanning) {