### Godot version

v4.0 rc6

### System information

Windows 10

### Issue description

When using a ViewportTexture from a SubViewport on a TextureRect, it throws errors after running the scene once and then switching scenes in the editor.
![Pasted image 20230227212626](https://user-images.githubusercontent.com/44676282/221680047-984fa03e-33d1-4856-9a7f-1700b28423cf.png)


### Steps to reproduce

Run the canvas-scene once.
Switch to another scene in the editor.
Switch back to the canvas-scene

### Minimal reproduction project

[ViewportTextureError.zip](https://github.com/godotengine/godot/files/10844099/ViewportTextureError.zip)

if (p_id.is_empty()) {
		ResourceCache::path_cache_lock.write_lock();
		ResourceCache::resource_path_cache[p_path].erase(get_path());
		ResourceCache::path_cache_lock.write_unlock();
	} else {
		ResourceCache::path_cache_lock.write_lock();
		ResourceCache::resource_path_cache[p_path][get_path()] = p_id;
		ResourceCache::path_cache_lock.write_unlock();
	}
}
String Resource::get_id_for_path(const String &p_path) const {
	ResourceCache::path_cache_lock.read_lock();
	if (ResourceCache::resource_path_cache[p_path].has(get_path())) {
		String result = ResourceCache::resource_path_cache[p_path][get_path()];
		ResourceCache::path_cache_lock.read_unlock();
		return result;
	} else {
		ResourceCache::path_cache_lock.read_unlock();
		return "";
	}
}
#endif
void Resource::_bind_methods() {