Shulker boxes and bundles drop their items twice when thrown into a lava cauldron

The bug

With the new snapshot 20w51a shulker boxes and bundles drop their items twice when thrown into a lava cauldron, instead of only once, allowing you to duplicate items.

How to reproduce:

1. Place a cauldron

2. Fill it with lava

3. Place a shulker box

4. Put an item in it

5. Throw the shulker box into the cauldron
   ❌ You get the item twice.