### 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.
bool stopped = false;
	Ref<InputEvent> ev = p_input;
	
	bool is_pointer_event = Ref<InputEventMouse>(p_input).is_valid() || Ref<InputEventScreenDrag>(p_input).is_valid() || Ref<InputEventScreenTouch>(p_input).is_valid();
	Ref<InputEventMouseButton> mb = p_input;
	bool is_scroll_event = mb.is_valid() &&
			(mb->get_button_index() == MouseButton::WHEEL_DOWN ||
					mb->get_button_index() == MouseButton::WHEEL_UP ||
					mb->get_button_index() == MouseButton::WHEEL_LEFT ||
					mb->get_button_index() == MouseButton::WHEEL_RIGHT);
	CanvasItem *ci = p_control;
	while (ci) {
		Control *control = Object::cast_to<Control>(ci);