Side Quest Bug solution
Instead of banning those who took advantage of the bug, or taking away their rewards( although that's probably the best bet) how about you let us play whatever path you want but the entry cost still remains. Now I know it sounds crazy because there are some epic rewards in this quest, in my mind it makes sense and is fair to all. I Understand that this brings up some problems like each day you get 5,000 6* shards if you choose on legendary difficulty, but I think it is worth considering.