I don't know if it's for survival mode too. Anyway the dupe is that if your on a donkey with stuff in its chests and log out riding it; it will dupe (the donkey) as well as the items in the chests. I don't know about horses or mules though (I'm talking about the grey one. so I don't know if that's the mule or donkey I could be wrong). (by the way I private messaged this because I don't want anyone to try and dupe thier donkey or mule and their diamonds too. XD :3).
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Changed ticket to public because donkey chest issue already mentioned in the duplicated ticket.
19th duplicate of MC-13737, please use the search function to see if your bug has already been submitted. Currently over 55% of tickets are being closed as duplicate.