This week, maybe on Monday, I have asked a question and self-answered it. Since I detected a mistake in my answer, I wanted to correct it. Until I figured out what the exact answer is (I needed to identify the problematic steps), I have deleted the answer (since it was not correct) and the question (so nobody spends effort on answering something I already know).
However, I cannot find my deleted question and answer any more, even if I look in my profile "all actions".
It was a well-researched question and it will take me ~1 hour of reconstructing everything.