### 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!

f = f.substr(6, f.length());
	f = f.replace("\\", "/");
	if (f.is_empty()) {
		return filesystem;
	}
	if (f.ends_with("/")) {
		f = f.substr(0, f.length() - 1);
	}
	Vector<String> path = f.split("/");
	if (path.size() == 0) {
		return nullptr;
	}
	EditorFileSystemDirectory *fs = filesystem;
	for (int i = 0; i < path.size(); i++) {
		int idx = -1;
		for (int j = 0; j < fs->get_subdir_count(); j++) {
			if (fs->get_subdir(j)->get_name() == path[i]) {
				idx = j;
				break;
			}
		}
		if (idx == -1) {
			return nullptr;
		} else {
			fs = fs->get_subdir(idx);
		}
	}
	return fs;
}
void EditorFileSystem::_save_late_updated_files() {