### 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!

ERR_FAIL_INDEX_V(p_idx, subdirs.size(), nullptr);
	return subdirs[p_idx];
}
int EditorFileSystemDirectory::get_file_count() const {
	return files.size();
}
String EditorFileSystemDirectory::get_file(int p_idx) const {
	ERR_FAIL_INDEX_V(p_idx, files.size(), "");
	return files[p_idx]->file;
}
String EditorFileSystemDirectory::get_path() const {
	String p;
	const EditorFileSystemDirectory *d = this;
	while (d->parent) {
		p = d->name.path_join(p);
		d = d->parent;
	}
	return "res://" + p;
}
String EditorFileSystemDirectory::get_file_path(int p_idx) const {
	String file = get_file(p_idx);
	const EditorFileSystemDirectory *d = this;
	while (d->parent) {
		file = d->name.path_join(file);
		d = d->parent;
	}
	return "res://" + file;
}
Vector<String> EditorFileSystemDirectory::get_file_deps(int p_idx) const {