### 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;
	if (is_inside_tree() && window_id != DisplayServer::MAIN_WINDOW_ID) {
		ERR_FAIL_MSG("Only the root window can set and use font oversampling.");
	}
	use_font_oversampling = p_oversampling;
	_update_viewport_size();
}
bool Window::is_using_font_oversampling() const {
	ERR_READ_THREAD_GUARD_V(false);
	return use_font_oversampling;
}
DisplayServer::WindowID Window::get_window_id() const {
	ERR_READ_THREAD_GUARD_V(DisplayServer::INVALID_WINDOW_ID);
	if (embedder) {
		return parent->get_window_id();
	}
	return window_id;
}
void Window::set_mouse_passthrough_polygon(const Vector<Vector2> &p_region) {
	ERR_MAIN_THREAD_GUARD;
	mpath = p_region;
	if (window_id == DisplayServer::INVALID_WINDOW_ID) {
		return;
	}
	DisplayServer::get_singleton()->window_set_mouse_passthrough(mpath, window_id);
}
Vector<Vector2> Window::get_mouse_passthrough_polygon() const {
	return mpath;
}
void Window::set_wrap_controls(bool p_enable) {