[GAMEPLAY] Minion auto attack did no damage (aa cancel?)

Video of bug below

Blue range minion auto attacked the red range minion and it did no damage. Possibly related to kalista autoing poppy, getting the ranged minion's aggro, and then kalista going into the bush dropping aggro.

Happens at 00:03 http://plays.tv/video/569db0ce7877c61da3