Hey everyone.
I was looking for a topic about that bug and I haven't found one (which doesn't mean it doesn't exist).
So on the 4th boss, Rizzuk and Avalanche, if you wipe/reset battle Avalanche will not respawn properly. You'll see it's health bar and you can damage it but instead of an ice atro you'll see a broken pieces of an ice atro and if you Tab Target it you'll see it's stuck underground. Some people would say that it's cool because once you wipe you only have to worry about the goblin on every other attempt. But there are people like me who would like to get Cold Potato achievement and after a wipe it's impossible because Avalanche won't spawn Glacial Prison.
Now everyone who wants to get that achivement has to either do it in a first try without wiping or reset the whole dungeon after a wipe. Since it's not a triple achievement (no-death+speed run+hard mode) there should be a possibility to repeat it. And let's be honest, it shouldn't be this way anyway it just doesn't feel right when you see it.
Cheers.