QSignalSpy::wait() does not always report success when a signal has been emitted

When there are multiple QSignalSpys operating on the same object, then it seems that the second QSignalSpy that has wait() called on it does not return true even though the signal itself has been emitted.

Attached is an example where the released spy is failing even when the signal is clearly emitted. This is using QtQuickControls2 as a means of reproducing because it is not consistently happening all the time (since other tests are working fine with a similar approach).