Playing Monkey magic league and used Flitch on my own character. Later noticed that the attack I grabbed was revealed to my opponent. Not the intended use of the card but not the behavior I expected either.
All transferred cards were revealed, traditionally. It's only recently that Battlefield Tactics & ABT were changed to not reveal the transferred card(s). I think this is fine?
I've seen this use a lot, and while it's not really a bug to have it not revealed, having an opponent waste a backstab on some hidden Tough Bark would be nice. It would probably be annoying to code it so that it only reveals the opponent's own cards, though.
Probably WAI but yes I had expected to work a bit like battlefield training in that way. Didn't make an impact on the game but just something I thought could be tweaked in general. Especially if a thief class is ever introduced.