This bug appears when you swimming with use sneak and go down. To swimming with sneak you must swim and touch the down button (under jump button). You can't go up again in. But not in creative . Please fix it.
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[Mojang] Mega_Spud (Jay)
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-32478.
Your additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
If you have not, you might like to make use of the search feature before making a new ticket, as it's likely that the issue has been reported already.
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