When Qt is not driving the event dispatching, the event loop level of the thread will stay 0. As a result, we will not automatically bump the deferred delete event's scope level to 1 when the deferred delete happens from a code path that doesn't raise the scope level via QScopedScopeLevelCounter, leaving the event with loop and scope level 0. As we only process these 0+0 deferred delete events automatically from QCoreApplicationPrivate::execCleanup(), which is not going to be called when the app doesn't call QCoreAppliction::exec(), we were failing to process the deferred deletes both during the application's runtime, as well as on shutdown. Task-number: QTBUG-120124 Fixes: QTBUG-117975 Pick-to: 6.7 6.6 6.5 Change-Id: I2b8accb432517a48370923ee2d760f8e2e4a8055 Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>