I thought when I broke a shulker box full of items, it would drop so I could pick it up, but that turned out not what to be what happened, the shulker box didn't drop.

In order to recreate the bug do the following
1. Go into a new world created in the snapshot.

2. Place down a shulker box and put an item in it.
3. Left-click to break the shulker box, while pressing no other keys.