### 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)

ERR_MAIN_THREAD_GUARD;
	if (p_use_own_world_3d == own_world_3d.is_valid()) {
		return;
	}
	if (is_inside_tree()) {
		_propagate_exit_world_3d(this);
	}
	if (p_use_own_world_3d) {
		if (world_3d.is_valid()) {
			own_world_3d = world_3d->duplicate();
			world_3d->connect_changed(callable_mp(this, &Viewport::_own_world_3d_changed));
		} else {
			own_world_3d = Ref<World3D>(memnew(World3D));
		}
	} else {
		own_world_3d = Ref<World3D>();
		if (world_3d.is_valid()) {
			world_3d->disconnect_changed(callable_mp(this, &Viewport::_own_world_3d_changed));
		}
	}
	if (is_inside_tree()) {
		_propagate_enter_world_3d(this);
	}
	if (is_inside_tree()) {
		RenderingServer::get_singleton()->viewport_set_scenario(viewport, find_world_3d()->get_scenario());
	}
	_update_audio_listener_3d();
}
bool Viewport::is_using_own_world_3d() const {