When revealing the ice trap secret card against hunters, the card that triggered the trap becomes unplayable entirely, even if you have the mana required to play the card.
Yes! same thing happened to me
Yes. Can confirm. Happened multiple times to me. Can provide video
Already known. If that happens to you, try the workaround below, others have reported that quitting the game and re-entering it (to join the game in progress) clears the problem: