I don't think it's that complicated. The output to any input is non deterministic. Some borderline queries will sometimes work other times get rejected.

I sincerely doubt they just nuked this query in 15 mins. Much more likely is that it had a 1 in 4 chance of succeeding originally, and now when you ran it, you hit the 3 in 4 case of rejection. Try running it again or in a new session.