### 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)

}
			code += "		float current_depth = 0.0;\n";
			code += "		while(current_depth < depth) {\n";
			code += "			ofs -= delta;\n";
			if (flags[FLAG_INVERT_HEIGHTMAP]) {
				code += "			depth = texture(texture_heightmap, ofs).r;\n";
			} else {
				code += "			depth = 1.0 - texture(texture_heightmap, ofs).r;\n";
			}
			code += "			current_depth += layer_depth;\n";
			code += "		}\n";
			code += "		vec2 prev_ofs = ofs + delta;\n";
			code += "		float after_depth  = depth - current_depth;\n";
			if (flags[FLAG_INVERT_HEIGHTMAP]) {
				code += "		float before_depth = texture(texture_heightmap, prev_ofs).r - current_depth + layer_depth;\n";
			} else {
				code += "		float before_depth = ( 1.0 - texture(texture_heightmap, prev_ofs).r  ) - current_depth + layer_depth;\n";
			}
			code += "		float weight = after_depth / (after_depth - before_depth);\n";
			code += "		ofs = mix(ofs,prev_ofs,weight);\n";
		} else {
			if (flags[FLAG_INVERT_HEIGHTMAP]) {
				code += "		float depth = texture(texture_heightmap, base_uv).r;\n";
			} else {
				code += "		float depth = 1.0 - texture(texture_heightmap, base_uv).r;\n";
			}
			
			
			
			code += "		vec2 ofs = base_uv - view_dir.xy * depth * heightmap_scale * 0.01;\n";