### 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)

set_input_as_handled();
				}
				return;
			}
		} else {
			bool stopped = false;
			ObjectID control_id = gui.touch_focus[touch_index];
			Control *over = control_id.is_valid() ? Object::cast_to<Control>(ObjectDB::get_instance(control_id)) : nullptr;
			if (over && over->can_process()) {
				touch_event = touch_event->xformed_by(Transform2D()); 
				pos = over->get_global_transform_with_canvas().affine_inverse().xform(pos);
				touch_event->set_position(pos);
				stopped = _gui_call_input(over, touch_event);
			}
			if (stopped) {
				set_input_as_handled();
			}
			gui.touch_focus.erase(touch_index);
			return;
		}
	}
	Ref<InputEventGesture> gesture_event = p_event;
	if (gesture_event.is_valid()) {
		gui.key_event_accepted = false;
		_gui_cancel_tooltip();
		Size2 pos = gesture_event->get_position();
		Control *over = gui_find_control(pos);
		if (over) {
			bool stopped = false;
			if (over->can_process()) {