I tried the quest again last night and i’m please to report i beat the living kitten out of the already dead undead. so i’m guessing one of three things happened.
1) the bug is fixed (but probably not cuz the the guy on top posted three hours ago saying there’s still a problem)
2) i became a much better player (might be slightly possible as i have trained in mob control with centaurs during this time figuring out the best ways to focus on one kill and literally blow away any minions that manage to catch me after speed boon using exploding pushback turrets, bought new equipment, and went into the courtyard with the only intent on killing the veterans then and there)
3) the bug randomly happens (which means when you realize you can’t win, stop trying and load up the quest from scratch rather than reviving endlessly and breaking all your equipment), because i do vaguely remember that there was one or two minions that were level 59…
and after i finished off the dragon and was at the debriefing, there was this one veteran that suddenly jumped out at me, probably missed him in the fight?