Chests 'shake' while breaking

What I expected to happen was...:
First of all, while you break a block it stays still. However, I was trying to break apart a double chest and the chest shook while I was breaking it. Unknown if this is intentional, but it seems wrong.

Steps to Reproduce:
1. Place a chest or double chest.
2. Break it. It will shake/jerk around while being broken.