Unnecessary clickable (expanding) button in locals view for QLinkedList<qulonglong>

Inside function testQLinkedList from the simple gdb project test, there's a QLinkedList<qulonglong> object. The data displayed in the local views for its elements is correct. However, the "arrow/expanding button" which is usually displayed only for aggregate types is visible (please see screen shot). It shouldn't be since the elements are qulonglong.