While Playing in the duskmourn quick draft, I experienced a bug where, after doing damage to a player, the game declared a sudden loss for me. There are no card in play, or in the graveyard, that wouldve caused a loss. This was extremely frustrating as it was my third loss, and was close to winning the game as well.

I've attached the game log. Right as my two attackers had dealt damage, and two Enduring Curiosities had gone onto my stack, the game declares a defeat.

After combing the game log, I believe the error is on line 442101. Here you can see I declare attackers, and my enduring curiosity triggers. This results in the error "Ability found on card is missing from the _abilities dictionary." The full message is [442101] [UnityCrossThreadLogger][GreInterface Notices] {"Warning":[{"message":"Ability found on card is missing from the _abilities dictionary.","context":{"abilityId":347,"cardId":92176}}