### 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)
_notify_theme_override_changed();
		} else {
			return false;
		}
	} else {
		if (name.begins_with("theme_override_icons/")) {
			String dname = name.get_slicec('/', 1);
			add_theme_icon_override(dname, p_value);
		} else if (name.begins_with("theme_override_styles/")) {
			String dname = name.get_slicec('/', 1);
			add_theme_style_override(dname, p_value);
		} else if (name.begins_with("theme_override_fonts/")) {
			String dname = name.get_slicec('/', 1);
			add_theme_font_override(dname, p_value);
		} else if (name.begins_with("theme_override_font_sizes/")) {
			String dname = name.get_slicec('/', 1);
			add_theme_font_size_override(dname, p_value);
		} else if (name.begins_with("theme_override_colors/")) {
			String dname = name.get_slicec('/', 1);
			add_theme_color_override(dname, p_value);
		} else if (name.begins_with("theme_override_constants/")) {
			String dname = name.get_slicec('/', 1);
			add_theme_constant_override(dname, p_value);
		} else {
			return false;
		}
	}
	return true;
}
bool Window::_get(const StringName &p_name, Variant &r_ret) const {