### 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.
for (const ObjectID &id : gui.canvas_parents_with_dirty_order) {
		Object *obj = ObjectDB::get_instance(id);
		if (!obj) {
			continue; 
		}
		Node *n = static_cast<Node *>(obj);
		for (int i = 0; i < n->get_child_count(); i++) {
			Node *c = n->get_child(i);
			CanvasItem *ci = Object::cast_to<CanvasItem>(c);
			if (ci) {
				ci->update_draw_order();
				continue;
			}
			CanvasLayer *cl = Object::cast_to<CanvasLayer>(c);
			if (cl) {
				cl->update_draw_order();
			}
		}
	}
	gui.canvas_parents_with_dirty_order.clear();
}
void Viewport::_sub_window_update_order() {