### Godot version

4.0.3.stable

### System information

Windows 10/11

### Issue description

I want the player's cursor to change when highlighting pickable Area2Ds; to do this, I have the areas modify the `mouse_default_cursor_shape` property on an external Control when the mouse enters or exits. If another Control appears in front of the Area2D while the mouse is over it, there is a chance that the project will crash.

Nothing prints to the IDE's output on this crash. If running the editor with console, then
```
ERROR: Condition "slot >= slot_max" is true. Returning: nullptr
   at: get_instance (./core/object/object.h:972)
```
will sometimes appear alongside the crash. If it appears, it always appears twice.

When I run a debug build of the editor through WinDbg, WinDbg will catch the following exception:
```
(3b58.2aac): Access violation - code c0000005 (!!! second chance !!!)
godot_windows_editor_x86_64!ObjectDB::get_instance [inlined in godot_windows_editor_x86_64!Viewport::_cleanup_mouseover_colliders+0x6f]:
00007ff6`ac254a1f 488b5310        mov     rdx,qword ptr [rbx+10h] ds:cccccccc`c31c419b=????????????????
```
When using this method, the exception is not random; it always occurs on the first attempt.

### Steps to reproduce

- Open the minimal reproduction project in the editor.
- Run the project.
- Click on the Area2D (you'll want visible collision shapes on).
- A full-screen button will pop up. If the game does not crash at this point, clicking the button will hide it so you can try again. It should crash within a few seconds of mashing.

### Minimal reproduction project

[Crash Test.zip](https://github.com/godotengine/godot/files/12027772/Crash.Test.zip)

if (control) {
			if (control->data.mouse_filter != Control::MOUSE_FILTER_IGNORE) {
				control->_call_gui_input(ev);
			}
			if (!control->is_inside_tree() || control->is_set_as_top_level()) {
				break;
			}
			if (gui.key_event_accepted) {
				stopped = true;
				break;
			}
			if (control->data.mouse_filter == Control::MOUSE_FILTER_STOP && is_pointer_event && !(is_scroll_event && control->data.force_pass_scroll_events)) {
				
				stopped = true;
				break;
			}
		}
		if (is_input_handled()) {
			
			break;
		}
		if (ci->is_set_as_top_level()) {
			break;
		}
		ev = ev->xformed_by(ci->get_transform()); 
		ci = ci->get_parent_item();
	}
	return stopped;
}
void Viewport::_gui_call_notification(Control *p_control, int p_what) {