Collectible Card Game Headquarters

Describe the Bug:
When Adun Oakenshield's activated ability resolves, the targeted creature card is not returned to Adun's controller's hand.

Which card did behave improperly ?
Adun Oakenshield

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
BfZ, Gauntlet

What exactly should be the correct behavior/interaction ?
When Adun Oakenshield's activated ability resolves, the targeted creature card is returned to Adun's controller's hand.

Are any other cards possibly affected by this bug ?
-

Targeting used the new internal interface for targeting cards in the graveyard (which can still find the targeted card even if other cards are added to or removed from the same graveyard before resolution), but validation and resolution used the old one (which can't), and they're not compatible. Fixed in e9982b9.