Hopefully the game auto collects crash reports but just in case, hard lock and crash on what maybe was the final encounter--didnt complete. Upvote only if you also had this issue for bungie support.
Edit: I have been able to complete the dungeon just fine. Its just the Dares of Eternity.
Edit 2: I have been able to complete if i am not in a solo fireteam and am no the leader.
Seriously frustrating as you lose all progress on bounties. Perhaps in the future that type of bounty should be avoided considering. I have probably had 5 - 10 bounties reset from this.
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We've found that not killing the upstoppable champions lessens the chance of the game crashing. If an unstoppable starts chasing someone, we just have them run the champion away from everyone else.