### Godot version

4.0.dev (f581f21dd61a8fb581b80d07755cdf60c95d146d)

### System information

Windows 10 - Ryzen 7 - 4070ti

### Issue description

When using the threaded resource loader, textures on materials are lost.

This is the scene being loaded in the IDE:
![image](https://github.com/godotengine/godot/assets/1945449/232dd16b-81c4-49cf-a980-3efcfa97ff79)

This is the result in runtime:
![image](https://github.com/godotengine/godot/assets/1945449/235176d3-6058-4bed-8fbe-cad14a5e0d32)


### Steps to reproduce

Use code such as the following to load a scene:
```
func _load_scene(p_scene_path):
	var new_scene : PackedScene
	if ResourceLoader.has_cached(p_scene_path):
		# Load cached scene
		new_scene = ResourceLoader.load(p_scene_path)
	else:
		# Start the loading in a thread
		ResourceLoader.load_threaded_request(p_scene_path)

		# Loop waiting for the scene to load
		while true:
			var progress := []
			var res := ResourceLoader.load_threaded_get_status(p_scene_path, progress)
			if res != ResourceLoader.THREAD_LOAD_IN_PROGRESS:
				break;

			_progress_bar = progress[0]
			await get_tree().create_timer(0.1).timeout

		# Get the loaded scene
		new_scene = ResourceLoader.load_threaded_get(p_scene_path)
	
	$CanvasLayer.visible = false
	add_child(new_scene.instantiate())
```

Now create a scene to load that has a material with a texture.

### Minimal reproduction project

[TestResourceLoader.zip](https://github.com/godotengine/godot/files/11549692/TestResourceLoader.zip)

List<PropertyInfo> none_subgroup;
						none_subgroup.push_back(info);
						HashMap<String, List<PropertyInfo>> subgroup_map;
						subgroup_map.insert("<None>", none_subgroup);
						groups.insert(last_group, subgroup_map);
						vgroups.push_back(Pair<String, LocalVector<String>>(last_group, { "<None>" }));
					}
					if (!groups[last_group].has(last_subgroup)) {
						PropertyInfo info;
						info.usage = PROPERTY_USAGE_SUBGROUP;
						info.name = last_subgroup.capitalize();
						info.hint_string = "shader_parameter/";
						List<PropertyInfo> subgroup;
						subgroup.push_back(info);
						groups[last_group].insert(last_subgroup, subgroup);
						for (Pair<String, LocalVector<String>> &group : vgroups) {
							if (group.first == last_group) {
								group.second.push_back(last_subgroup);
								break;
							}
						}
					}
				} else {
					last_group = "<None>";
					last_subgroup = "<None>";
					is_none_group = true;
				}
				continue; 
			}
			if (is_none_group_undefined && is_none_group) {