### Godot version

4.0.2

### System information

Windows 11

### Issue description

Changing node type from PopupMenu to ItemList causes Godot to crash

### Steps to reproduce

Change node type from PopupMenu to ItemList

### Minimal reproduction project

n/a
uint64_t now = OS::get_singleton()->get_ticks_msec();
				uint64_t diff = now - popup_time_msec;
				if (diff < 150) {
					return;
				}
				int over = _get_mouse_over(b->get_position());
				if (over < 0) {
					if (!was_during_grabbed_click) {
						hide();
					}
					return;
				}
				if (items[over].separator || items[over].disabled) {
					return;
				}
				if (!items[over].submenu.is_empty()) {
					_activate_submenu(over);
					return;
				}
				activate_item(over);
			}
		}
	}
	Ref<InputEventMouseMotion> m = p_event;
	if (m.is_valid()) {
		if (m->get_velocity().is_zero_approx()) {
			return;
		}
		activated_by_keyboard = false;