I submitted a bug report about this, but figure I might also post here in case other players can add additional details/reproduction steps.
Issue: Crash after clearing a secret room
This is an issue that appears to be new to version 0.6.21. After completing a secret room in one of the new dungeons, the game appear liable to crash. I have observed this issue twice tonight (August 1st), each in separate dungeons.
I do not recall which room I encountered the first crash in, but the 2nd crash I experienced was in a last room of the 2nd dungeon leading to the minotaur boss. After defeating all the monsters in this secret room, the game crashed. I did not appear to receive a reward for clearing the secret room, and the dungeon was not completed. I do not recall whether or not the blue-secret-chest-opening animation played or not.
In case it’s relevant, my team consisted of the Wizard, the Cleric, the Warlock, and the Ranger.