I had a shulker box I wanted to place and as I was placing it, my tamed wolf fell in the same spot as I was placing the shulker box. The shulker box disappeared. It didn't break or drop any items or move the wolf, it just disappeared which is a bit of a problem.

What I expected to happen was...:
Not disappear. Maybe break or move the wolf or just not remove it from my inventory and not place it.

What actually happened was...:
It was removed from my inventory and wasn't placed meaning it and the items inside couldn't be retrieved.

Steps to Reproduce:
1. Find a block to place the shulker on.
2. Have a wolf fall on to said block.

3. Right as the wolf is in the block, place the shulker box.

It might work with other mobs and blocks. I haven't tried it yet.