### 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;
	canvas_transform = p_transform;
	if (!override_canvas_transform) {
		RenderingServer::get_singleton()->viewport_set_canvas_transform(viewport, find_world_2d()->get_canvas(), canvas_transform);
	}
}
Transform2D Viewport::get_canvas_transform() const {
	ERR_READ_THREAD_GUARD_V(Transform2D());
	return canvas_transform;
}
void Viewport::_update_global_transform() {
	Transform2D sxform = stretch_transform * global_canvas_transform;
	RenderingServer::get_singleton()->viewport_set_global_canvas_transform(viewport, sxform);
}
void Viewport::set_global_canvas_transform(const Transform2D &p_transform) {
	ERR_MAIN_THREAD_GUARD;
	global_canvas_transform = p_transform;
	_update_global_transform();
}
Transform2D Viewport::get_global_canvas_transform() const {
	ERR_READ_THREAD_GUARD_V(Transform2D());
	return global_canvas_transform;
}
void Viewport::_camera_2d_set(Camera2D *p_camera_2d) {
	camera_2d = p_camera_2d;
}
void Viewport::_audio_listener_2d_set(AudioListener2D *p_listener) {