### Godot version

4.0.3.stable

### System information

windows 11

### Issue description

fullscreen on the window node is not working and will show up as a windowed.

### Steps to reproduce

disable Embed Subwindows in Project Settings/Display/Window.
create a window node and set its mode to fullscreen.

### Minimal reproduction project

[fullscreen.zip](https://github.com/godotengine/godot/files/11821834/fullscreen.zip)
ERR_MAIN_THREAD_GUARD;
	size = p_size;
	_update_window_size();
}
Size2i Window::get_size() const {
	ERR_READ_THREAD_GUARD_V(Size2i());
	return size;
}
void Window::reset_size() {
	ERR_MAIN_THREAD_GUARD;
	set_size(Size2i());
}
Point2i Window::get_position_with_decorations() const {
	ERR_READ_THREAD_GUARD_V(Point2i());
	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		return DisplayServer::get_singleton()->window_get_position_with_decorations(window_id);
	}
	return position;
}
Size2i Window::get_size_with_decorations() const {
	ERR_READ_THREAD_GUARD_V(Size2i());
	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		return DisplayServer::get_singleton()->window_get_size_with_decorations(window_id);
	}
	return size;
}
Size2i Window::_clamp_limit_size(const Size2i &p_limit_size) {