[fixed]Volrath's Shapeshifter can't be activated as a copy

[Aswan jaguar]

Describe the Bug:
Volrath's Shapeshifter ability to discard a card can't be activated when it is already a creature copy of the creature that is on top of graveyard.
Other bug about Volrath's Shapeshifter here: viewtopic.php?f=86&t=15677&p=165279&hilit=Volrath%27s+Shapeshifter#p163678

Which card did behave improperly ?
Volrath's Shapeshifter

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/08/27: Eldritch Moon v2, duel

What exactly should be the correct behavior/interaction ?
Volrath's Shapeshifter ability can be activated when it copies another creature as it has also the discard ability.

Are any other cards possibly affected by this bug ?
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[Gargaroz]

Fixed in 8cd3817