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Describe the Bug:
AI 4,5 times destroyed my Rancor by activating Aura Fracture.Every time Rancor was destroyed a legacy of Rancor was left attached on enchanted by Rancor creature.The legacy didn't give bonus to creature but while it was present Rancor didn't return back to my hand.That happened when an action took place legacy was removed and Rancor returned to my hand.This didn't happen with other destroy enchantment spells.(Calming Verse comes to mind).

Which card did behave improperly ?
Aura Fracture or Rancor

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/08/07: Eldritch Moon, duel

What exactly should be the correct behavior/interaction ?
Aura Fracture when destroys Rancor the latter goes back to hand from grave immediately.

Are any other cards possibly affected by this bug ?
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Nothing looks obviously wrong with the code. (Other than that Aura Fracture won't let you target permanents that are both enchantments and planeswalkers.)

Suspect this is because enchantments (and planeswalkers, but not anything that's part artifact, creature, or land) don't defer kill_card_guts() from within kill_card_impl().

Exactly the same happened with Nullmage Advocate and Rancor.Maybe something to do with activated abilities?