Immerwolf Bug
Playing on PC, I played the card Immerwolf in a werewolf deck that had a couple of other already transformed werewolfs on the board, and it was night. When it turned to day, the animation and sound effect for a card cancelling an effect played as I would expect it to, and my wolves did not flip back to their day sides, as expected. However, during my opponent's turn, whenever they played something or an effect went onto the stack, the cancelling animation and sound effects would play again 3-4 times in quick succession, which was pretty annoying and probably not supposed to happen. Nothing happened to my werewolves on the board, they behaved as they should, the bug was only with the animation and sound effect repeatedly playing when they shouldn't have.