### Godot version

v4.1.dev.custom_build [18112ba36]

### System information

Linux Mint 21.1, NVIDIA GeForce GTX 1050 Ti,  Vulkan API 1.3.205

### Issue description

This is a regression from #64388. 

Textures seem to be used differently in 2D and 3D. They are rendered using the `RID` in 3D, and changing the `viewport_path` will cause the `RID` to change.

https://github.com/godotengine/godot/assets/30386067/ad393fe8-50c1-4a89-870d-58d4e224bcc6


### Steps to reproduce

1. Download and import MRP.
2. Open 1.tscn, and try to switch the `viewport_path` of the `MeshInstance3D:mesh:material:albedo_texture` in the MeshInstance3D node.
3. After switching, the MeshInstance3D is rendered as white in the editor;
4. Close and then reopen 1.tscn.

### Minimal reproduction project

[ViewportTexture-change-viewport_path.zip](https://github.com/godotengine/godot/files/11509010/ViewportTexture-change-viewport_path.zip)

int index = _sub_window_find(p_window);
	ERR_FAIL_COND(index == -1);
	ERR_FAIL_NULL(RenderingServer::get_singleton());
	RS::get_singleton()->free(gui.sub_windows[index].canvas_item);
	gui.sub_windows.remove_at(index);
	if (gui.sub_windows.size() == 0) {
		RS::get_singleton()->free(subwindow_canvas);
		subwindow_canvas = RID();
	}
	if (gui.currently_dragged_subwindow == p_window) {
		gui.subwindow_drag = SUB_WINDOW_DRAG_DISABLED;
		gui.currently_dragged_subwindow = nullptr;
	}
	if (gui.subwindow_focused == p_window) {
		Window *new_focused_window;
		Window *parent_visible = p_window->get_parent_visible_window();
		gui.subwindow_focused->_event_callback(DisplayServer::WINDOW_EVENT_FOCUS_OUT);
		if (parent_visible) {
			new_focused_window = parent_visible;
		} else {
			new_focused_window = Object::cast_to<Window>(this);
		}
		if (new_focused_window) {
			int new_focused_index = _sub_window_find(new_focused_window);
			if (new_focused_index != -1) {
				gui.subwindow_focused = new_focused_window;
			} else {
				gui.subwindow_focused = nullptr;
			}
			new_focused_window->_event_callback(DisplayServer::WINDOW_EVENT_FOCUS_IN);