Collectible Card Game Headquarters

Describe the Bug:
When Clone Shell enters the battlefield, its controller is prompted to choose a card from his/her library (library viewer popup). The chosen card is not exiled.
Regardless of the chosen card, its controller is then prompted to put the top 3 cards of his/her library on the bottom of his/her library and a legacy effect card reading "none" is attached to Clone Shell.

Which card did behave improperly ?
Clone Shell

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
C14U, duel

What exactly should be the correct behavior/interaction ?
When Clone Shell enters the battlefield, its controller is prompted to choose a card from the top four cards of his/her library (library viewer popup). The chosen card is exiled.

Are any other cards possibly affected by this bug ?
-

All fixed in 2140790

2 issues

1) Don't know if it was a design decision, but imprinted card is not in the exile zone while Clone Shell is in play.

2) When Clone Shell dies the card imprinted on it vanishes (no longer in any zone) instead of entering the bf.

All fixed (and tested) in 011ab5b
Also HUMAN player could click on Clone Shell to see which card was exiled by it.