I was curious to see what changes had been made to Threnal loot, so I did a quick run through. Unfortunately the last quest "The Gate Chamber" refuses to complete. I kill the 5 giants inside and just...nothing happens. Have tried 3 times now with the same result. First was loading directly in from the previous dungeon, the others were after resetting and coming in from the Threnal wilderness.
Additionally, Chieftain Bergthrym just stays on the stairs and doesn't move or attack. This is probably related...there's some flag for his death that's not being triggered because he just sits there like a lump.