### Godot version

4.0.3-stable

### System information

Windows 10

### Issue description

In some projects ViewportTexture remains pink and doesn't render viewport content after upgrading from 4.0.2-stable to 4.0.3-stable. If a pair of files viewport.h/viewport.cpp are downgraded back to what they were in 4.0.2-stable, problem goes away.

This is how it looks in 4.0.3-stable:
![4 0 3_stable_viewport_4 0 3](https://github.com/godotengine/godot/assets/1449921/44c191a9-4b67-4b02-90b6-4ab615f62a73)

And this is how it looks if viewport.h/viewport.cpp are downgraded back to what they were in 4.0.2-stable.
![4 0 3_stable_viewport_4 0 2](https://github.com/godotengine/godot/assets/1449921/f5abc605-f129-4222-9c0e-e9a07621dd9d)



### Steps to reproduce

Unfortunately, I cannot come up wit a simple demo project reproducing the problem. It exists in some projects and doesn't exist in others.


### Minimal reproduction project

Cannot produce a simple project reproducing the problem. In simple projects it works fine.
ERR_MAIN_THREAD_GUARD;
	if (world_2d == p_world_2d) {
		return;
	}
	if (is_inside_tree()) {
		RenderingServer::get_singleton()->viewport_remove_canvas(viewport, current_canvas);
	}
	if (world_2d.is_valid()) {
		world_2d->remove_viewport(this);
	}
	if (p_world_2d.is_valid()) {
		bool do_propagate = world_2d.is_valid() && is_inside_tree();
		world_2d = p_world_2d;
		if (do_propagate) {
			_propagate_world_2d_changed(this);
		}
	} else {
		WARN_PRINT("Invalid world_2d");
		world_2d = Ref<World2D>(memnew(World2D));
	}
	world_2d->register_viewport(this);
	_update_audio_listener_2d();
	if (is_inside_tree()) {
		current_canvas = find_world_2d()->get_canvas();
		RenderingServer::get_singleton()->viewport_attach_canvas(viewport, current_canvas);
	}
}
Ref<World2D> Viewport::find_world_2d() const {