So I was doing my last Timewalking Dungeon in Grimrail Depot, wiped once on Nitrogg, tried again only to get him floating in the barrels succumbing to the Necrolord Rogue ability. Yes. I’m still inside.
imgur .com/j8nHH9i
Can confirm, as I was there
Edit: Before I left, boss was unkillable in 1 hp. The side walls didn’t drop either.