Breaking a Shulker Box in creative doesn't drop it

I broke a shulker box in Creative mode and it didn't drop.

What I expected to happen was...:
The shulker box would drop as an item.

What actually happened was...:
There were no items dropped.

Steps to Reproduce:
1. Get a shulker box
2. Put item(s) in it
3. In creative mode break it
4. Find that no shulker box dropped