Anointed Peacekeeper Issue(Probably Card Named Effect Issue)

[Greasefang]

When I play Commander Duel, I found that my Anointed Peacekeeper can't named Petty Theft, which is Brazen Borrower's adventure name. After that match, I searched CR, found that 715.5. says "If an effect instructs a player to choose a card name and the player wants to choose an adventurer card’s alternative name, the player may do so." So I think it's a bug, and it's not only Anointed Peacekeeper's problem, but all card named ability's.