shulker boxes react wierd next to living shulkers

i spawned down a shulker and placed a shulker box right next to it.

What I expected to happen was...:
nothing wierd

What actually happened was...:
the shulker box started to replicate the movements of the living shulker AND i couldnt open it

Steps to Reproduce:
1. summon a shulker
2. place a shulker box

 

you can see it in action here: https://www.youtube.com/watch?v=WqRRTUOm1eQ