QMessageBox return immediately on macOS if called from MenuBar and after a modal dialog

This bug is similar to QTBUG-111524 except for the start conditions:

• The QMessageBox have to be exec from the menuBar;
• Before the exec of the QMessageBox a modal dialog have to be opened;

Attached you will find an example to reproduce this error, just:

• Build and run the application on macOS with Qt 6.5
• Click Menu File -> Show message box
• Close first dialog with Ok or Cancel
• ERROR: the QMessageBox returns immediately

Remarks

• If you open the QMessageBox without before opening a dialog, or not via the menuBar, it is working correctly, the QMessageBox is not returning immediately.