PFID-63D8BD198F6CE62A
Have had this problem on normal quests, not on heroic. Did not try a legendary quest since noticing the bug. Exactly as earlier posters describe, the gold is added at the end of the scenario but not on my account after that despite being fully logged in. (iPad4, iOS 9.3.2)
Thanks for investigating, it means a lot to know that a dev is trying to fix it!