### Godot version

4.1.1

### System information

linux

### Issue description

[simplescreenrecorder-2023-08-30_15.01.51.webm](https://github.com/godotengine/godot-proposals/assets/71937306/537d92b9-4f98-4fe6-adf4-71297be0471a)

I guess this wasn't the case before since I could save a layout named "2 monitors".

### Steps to reproduce

press space

### Minimal reproduction project

none
TreeItem *item = Object::cast_to<TreeItem>(p_obj);
	
	if (item && !item->get_first_child()) {
		_store_selected_item(item);
	}
}
void ThemeItemImportTree::_select_all_subitems(TreeItem *p_root_item, bool p_select_with_data) {