### 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
ERR_MAIN_THREAD_GUARD;
	ERR_FAIL_INDEX(p_flag, FLAG_MAX);
	flags[p_flag] = p_enabled;
	if (embedder) {
		embedder->_sub_window_update(this);
	} else if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		if (!is_in_edited_scene_root()) {
			DisplayServer::get_singleton()->window_set_flag(DisplayServer::WindowFlags(p_flag), p_enabled, window_id);
		}
	}
}
bool Window::get_flag(Flags p_flag) const {
	ERR_READ_THREAD_GUARD_V(false);
	ERR_FAIL_INDEX_V(p_flag, FLAG_MAX, false);
	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		if (!is_in_edited_scene_root()) {
			flags[p_flag] = DisplayServer::get_singleton()->window_get_flag(DisplayServer::WindowFlags(p_flag), window_id);
		}
	}
	return flags[p_flag];
}
bool Window::is_maximize_allowed() const {
	ERR_READ_THREAD_GUARD_V(false);
	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		return DisplayServer::get_singleton()->window_is_maximize_allowed(window_id);
	}
	return true;
}
void Window::request_attention() {