Choose One cards make the game unresponsive in Battlegrounds, Book of Heroes (Faelin), Tombs of Terror.
In Battlegrounds Duos, I still see Seaglass, and I still get the bug.
In single player modes, when I play the card, the game freezes, then it sometimes continues with proper animations but freezes again when attacking, ending the turn or pretty much any other action. The game tracks actions, it just doesn’t perform them to the end, although if I alt+F4, it shows me that the actions were done correctly.
At first I actually noticed the problem not with Seaglass, but with Tombs of Terror anomaly (add 2 copies of the minion to the deck, they cost 1) mode where I had that “transform into one of her dragon forms” minion.
Also, in single player, when I press alt+F4, the game continues, if I press Quit, it counts as conceding. I understand the purpose for other modes, but not in this case.