When going underwater your hand (or the item you have in your hand) moves backwards
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duplicates 1
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Duplicate of MC-11287 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
I don't think this is a bug. I think this happens because you have a different point of view underwater.