Interlude - Holden Estate boss doesn't reset properly

During quest "Recruit the Ezyomytes" stage "Find the Thane and Lady" I killed the 'lady' and died to the buffed 'thane'. On respawn, the lady remained dead, I fought and killed the thane by himself, and the quest did not progress. I died intentionally outside the arena and waypointed back, and both are dead and uninteractable, with the quest state remaining "Find the Thane and Lady".

Will edit if resetting the area fixes the quest, but I haven't tried yet.

Ref# 940,137,982

I have the same problem and nothing helps

Same problem I killed the lady died to buffed thane and now the lady is dead but thane plays piano forever and does not attack no matter what.

UPDATE:
Go to map Ctrl+click on the map node start new one and they will reset