I’ve had this happen to me today, also. The only time it has happened though, is when I killed a treasure goblin during the run. I’ve had 3 runs that had a treasure goblin, out of 5 runs so far, and the only time I’ve had the issue of the dungeon not completing, are the 3 runs that I killed a treasure goblin in. All 5 of my runs, I have used the Tribute of Radiance (Resolute), and chosen a Bargain (4 runs with the Skill Ranks and 1 with the Passive Ranks bargain).