The new QMetaObject::invokeMethod with lambda support, leaks when using Qt::QueuedConnection.
See attached test application.

The leaks is happens in qtbase\src\corelib\kernel\qobjectdefs.h
line 535

new QtPrivate::QFunctorSlotObjectWithNoArgs<Func, decltype(function())>(function),

Note: I originally found this leak when using QMetaObject::invokeMethod with Qt::BlockingQueuedConnection across threads. In that case, there is more than one leak.
For the sake of simplicity, my demo app limits the case to single thread + Qt::QueuedConnection