### 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
Object::cast_to<Label>(p_control->get_child(0))->hide();
	
	Object::cast_to<Button>(p_control->get_child(2))->hide();
	Object::cast_to<Button>(p_control->get_child(3))->hide();
	
	Object::cast_to<LineEdit>(p_control->get_child(1))->set_text(p_item_name);
	Object::cast_to<LineEdit>(p_control->get_child(1))->show();
	
	Object::cast_to<Button>(p_control->get_child(4))->show();
	Object::cast_to<Button>(p_control->get_child(5))->show();
}
void ThemeTypeEditor::_item_rename_confirmed(int p_data_type, String p_item_name, Control *p_control) {