Exiling Split cards give incorrect mana to cards with jump-start in graveyard.

Snappyturtle

Cards that are exiled like Response/Resurgence with the Resurgence half being at full 10 mana give only 4 mana to cards like Beacon Bolt.

stikxs

"You can now exile split cards regardless of which side is selected." (But we aren't going to let you use extra mana on the backside)