yes i wanted to make sure you all look into this dupe glitch heres link to video of how it is done and still works on all 1.8 snapshots
https://www.youtube.com/watch?v=u0ejy0IEKXs
Thank you for your time
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Confirmed. Thanks for reporting!

Tested several times, confirmed. Also duplicated a sheep that wandered into the area on one test.
Appears to occur on chunk boundaries, and duplicates all entities in the chunk at time of load. Duplicated entities cannot be killed with the /kill command.