SEAT 22 same problem , it seems in all duns.
https://i.imgur.com/5O9Qa5q.jpg
u can check here HP of boss in retail.
https://www.youtube.com/watch?v=sbcQeQB_dzE
WoW Freakz link: https://www.wow-freakz.com/quest_helper.php?quest=36920
Bug description: Kor'vas Bloodthorn not giving following quests after we completed "From Within", neither her follow ...