Collectible Card Game Headquarters

Describe the Bug:
Avacyn's 1st ability can target itself even though it doesn't prevent damage.

Which card did behave improperly ?
Avacyn, Guardian Angel

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 ?
Must choose 'another target creature'.

Are any other cards possibly affected by this bug ?
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Fixed that the abilities couldn't be activated in commit de127852.
The target itself bug has been fixed by gargaroz previously.
Now that can be activated, it became known that no prevention of damage on resolution for both abilities.