### 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
}
	
	{
		for (int i = icon_items_list->get_child_count() - 1; i >= 0; i--) {
			Node *node = icon_items_list->get_child(i);
			node->queue_free();
			icon_items_list->remove_child(node);
		}
		HashMap<StringName, bool> icon_items = _get_type_items(edited_type, &Theme::get_icon_list, show_default);
		for (const KeyValue<StringName, bool> &E : icon_items) {
			HBoxContainer *item_control = _create_property_control(Theme::DATA_TYPE_ICON, E.key, E.value);
			EditorResourcePicker *item_editor = memnew(EditorResourcePicker);
			item_editor->set_h_size_flags(SIZE_EXPAND_FILL);
			item_editor->set_base_type("Texture2D");
			item_control->add_child(item_editor);
			if (E.value) {
				if (edited_theme->has_icon(E.key, edited_type)) {
					item_editor->set_edited_resource(edited_theme->get_icon(E.key, edited_type));
				} else {
					item_editor->set_edited_resource(Ref<Resource>());
				}
				item_editor->connect("resource_selected", callable_mp(this, &ThemeTypeEditor::_edit_resource_item));
				item_editor->connect("resource_changed", callable_mp(this, &ThemeTypeEditor::_icon_item_changed).bind(E.key));
			} else {
				if (ThemeDB::get_singleton()->get_default_theme()->has_icon(E.key, edited_type)) {
					item_editor->set_edited_resource(ThemeDB::get_singleton()->get_default_theme()->get_icon(E.key, edited_type));
				} else {
					item_editor->set_edited_resource(Ref<Resource>());
				}
				item_editor->set_editable(false);