### Godot version

2992ffd25523cb8b3e0ef1b873c40115b8940178

### System information

Windows 10

### Issue description

Godot crashes randomly within a few seconds after project start when moving with the mouse.

![win_err](https://github.com/godotengine/godot/assets/52464204/1da28596-d95b-40f3-b32f-12219ec02c5d)

Started after recent merge of https://github.com/godotengine/godot/pull/67791.
I can confirm that reverting the pr fixes the crashes.

### Steps to reproduce

see desc

### Minimal reproduction project

N/A
if (!wrap_controls) {
		updating_embedded_window = true;
		call_deferred(SNAME("_update_embedded_window"));
	} else {
		child_controls_changed();
	}
}
void Window::_update_embedded_window() {
	if (!updating_embedded_window) {
		return;
	}
	if (embedder) {
		embedder->_sub_window_update(this);
	};
	updating_embedded_window = false;
}
void Window::set_theme_type_variation(const StringName &p_theme_type) {
	ERR_MAIN_THREAD_GUARD;
	theme_type_variation = p_theme_type;
	if (is_inside_tree()) {
		notification(NOTIFICATION_THEME_CHANGED);
	}
}
StringName Window::get_theme_type_variation() const {