QMenu for QSystemTrayIcon doesn't work correctly if we declare it after QQmlApplicationEngine load method

If we declare (create) QMenu for QSystemTrayIcon after QQmlApplicationEngine load method (see main_incorrect.cpp at attachments) we have incorrect behaviour: the qmenu (right mouse click on QSystemTrayIcon item) doesn't disapear after outside click (not on the application window). Hovever, if we have declaration before the load method (see main_correct.cpp at attachments) we have absolute correct behaviour.

If you have similar problem in your project, just insert the next code in your main{} block and after that you can create QMenu for QSystemTrayIcon anywhere:

void bugFix()
{
    QMenu *trayIconMenu = new QMenu();
    QSystemTrayIcon * trayIcon = new QSystemTrayIcon();
    trayIcon->setContextMenu(trayIconMenu);
    delete trayIcon;
    delete trayIconMenu;
}