Attached in demo application to demonstrate the problem. In short the demo app and the problem is as follows:

1. The application has qpushbutton and menu item to call deleteLater for QLabel
2. The application has another label to indiate when destroyed signal is emiited for label for which deleteLater was called
3. When using push button to initiate deleteLater, destroyed signal will be emitted correctly and text in another label changes
4. When using options menu to initiate deleteLate, destroyed signal will be emitted when application is closed