When you place an item in an item frame with a comparator behind, you can duplicate the item when you leave/join the world if the item frame and the comparator are not in the same chunk.
This video shows how it works:
https://www.youtube.com/watch?v=mXBDcQP-U7E&list=UU_zlzZpJOmvr1WpS3wh7xyg
Dupe of MC-51610
Related issues
duplicates
Comments
migrated
marcono1234
Duplicate of MC-51610
mlakuss
Thank you.
I have seen this before. But I'm unable to find another ticket. Mods, I have the feeling this has been reported before.