Just playing with a friend on his world via Xbox Live. (A friend has Windows 10 Edition.)
I open the shulker with things (The things were the most common, golden apples and ender pearls.)

It also happens that a friend simply opens a shulker (any other, not necessarily that one) and it all ends with a crushing.

So there is nothing to describe, just an ordinary world on which we survive with a friend.

This bug happens often, almost every 10th open shulker.