Anvils that drop onto a torch will drop an item that is rotated based on the position they were placed, resulting in an otherwise unobtainable item being added to your inventory that doesn't stack with normal anvils.
Steps to Reproduce:
- Place an anvil above a torch so that it drops as an item
- Place another anvil in another direction above a torch
- When picked up, notice the two anvil items are different in your inventory