Interesting, it only exploded now - initially we were too fast (faster than
500 ms) so never noticed. Now that more tests with the similar event loop
handling were introduced, the last one was catching a single-shot timer
signal, accessing long dead object).
Fixes: QTBUG-87612
Change-Id: I52446fa7b08ef90a4742af3662da7837a8602941
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>