The bug

Falling anvils destroy shulker box items making them spit out their content. Falling dripstone, however, does not.

To reproduce

1. Fill two shulker boxes with any items and drop one of them on the ground.
2. Drop an anvil from 8 blocks high and see that the shulker box item is broken, dropping the contents.
3. Drop the second shulker box on the ground and drop a pointed dripstone from around the same height.

Observed result

The shulker box item isn't broken.

Expected result

The shulker box item would be broken.