Have been running across multiple bugs:
1) Epic Saga reward list does not always give artifacts. Everyone in my party received Artifacts in their reward list, and I got nothing. Just the typical XP/Favor/skill tomes and some mats. Very frustrated that I got screwed over. This is the True Elite (did first two quests on R5, rest on R8)
2) Irk in Just Business can leap off the edge of the quest and be stuck in a falling animation and be unkillable. Sent in a ticket, which remains unanswered 6 hours later. DPSed him for half an hour and he randomly teleported after dozens of HP resets (can beat him to 0 HP and he wont die until eventually his HP jumps up to 2/3rds). After a teleport, he jumped off again, but was able to get him to port after ~5 minutes of hitting and killed him then. This is a serious issue though.
3) Random plain daggers spawning in chests. This has been acknowledged and is stated not to be in placement of named loot, though does that really mean no optionals or red names provide loot? Just end chests? There are some extremely tough optionals that I would hope would have named loot behind them...
4) No Rare filigrees seem to be dropping. While there is a chance that ~100 filigree pulls amongst the party would have none, it is still statistically very unlikely so is a red flag to me.