Put the summary of the bug you're having here

What I expected to happen was...:

Shulker box to drop itself upon being broken in Creative Mode.

What actually happened was...:

Shulker box did not drop itself upon being broken in Creative Mode. It isn't clear as to whether it was a bug or a feature.

Steps to Reproduce:

1. Go into Creative Mode.
2. Place a Shulker Box on the ground.
3. (optional) Place any item of choice inside the Shulker Boxbox
4. Break the Shulker Box
5. Watch the Shulker box break and drop nothing, which effectively results in losing anything that may have been  inside.