In game #122727906 on oregon, turn 12, my opponent (milkman) played a Scepter for which they chose to play a Falconer, even though they hadn't played one that turn. I on the other hand had played a Falconer that turn as a reaction to one of their gains.
Unless I very much misinterpreted the card, I believe this is a bug in the system.
Cheers,
d
Yes, that is indeed a bug. :(