Riding a horse on farmland with potatos and jumping, upon land your horse breaks the crop and you are teleported off. Lots of weird glitches happen such as no being able to eat, break blocks, place blocks, jump or interact with blocks. to fix this glitch you have to shift and you will be teleported back to your horse.
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We're tracking this issue in MC-191714, so this ticket is being resolved and linked as a duplicate.
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Fixed MC-191714