Starting with 184.108.40.206 (or 220.127.116.11, I'm not entirely sure), villagers will pick up any item you throw at them. This is probably related to
Steps to reproduce:
- Throw a block, a diamond, or other random item at a villager.
- The villager will pick it up. You have now lost that item and cannot get it back, even if you kill the villager, because they don't drop the items in their inventory.