When I was opening a server for my friend and I, I had some horses named and leashed to a fence post and has a mount on and when I went to go on the horse my server would kick me and say "end of stream null. something I forgot and the horse would duplicate my friend told me.
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Duplicate of MC-13773 and MC-13628, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.