Doing a tier 12 nightmare in kor dragan barracks. Requires defeating blood boils but one blood boil didnt spawn, entire dungeon is cleared but cant complete.
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Also seen this on level 1 nightmare dungeon. Huge waste of time running around the dungeon repeatly looking for what I didn’t miss. 
I had the same issue on the tier 20 nightmare. I was reading that if the save the people event is in the instance it will bug out. Here is a video of me looking for the last Blood Boil.
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