If you die to the Echo knight(crucible boss) you will reswpan outside of the elevator to go back down, you then exit the game to the desktop and when you come back in you’ll be at the boss room again, when you kill him you wont go to the treasure room but youll go to the 1st floor of the crucible again. I wasent able to beat him a 2nd time in a row after getting back to him so idk if you go to the treasure room.
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Happened the same to me as well, same exact process.
yeah definitely not supposed to do that. Thanks for the report. 
Yep this just happened to me, I alt f4’d raged after coming the closest to beating him, then reloaded the game, and selected the same realm through the menu. And loaded outside the boss arena.
The next attempt m i killed him… Went on the elevator and was like… Ohh we starting again?
I initially thought it was an increased difficulty of the same levels.
Gotta go again and get to this treasure room though.
killed him twice in the same loop, no treasure room 