When u drop any item in the middle of two hoppers, it starts duplicating, here is an example duplication machine I made with a redstone clock and hoppers connected to dispensers.
As you can see the diamond starts trying to enter both hoppers, and starts duplicating.
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Oh sorry. Actually I saw 5998 but as there werent any pictures or even explanation on how to do it I made my own ticket. Sorry again.
Duplicate of: MC-5998 - Please use the search function to see if your bug has already been submitted.
Currently over 35% of tickets are being closed as duplicate.