Annie Tibbers Enrage bug?

I've noticed that when I die and tibbers enrages he'll chase after the enemy that killed me or the closest one around, however, If the enemy hides in a brush, Tibbers loses the scent and completely stops moving. An enemy can choose to pop into a brush and pop out in milliseconds and Tibbers will simply stand still. This is also the case when there is a group of enemies and tibbers is chasing after one of them who decides to pop into a brush, tibbers stops moving and disregards all the enemies around. Is this a bug or intended? It just seems completely pointless if Tibbers stops completely moving even if the enemy decides to pop back out again. Is it possible to allow the control of tibbers after we are dead like a Sion berserker type?
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