I have found a swimming glitch in experimental gameplay that does not allow you to escape a trench full of water. Jumping is entirely disabled and my character crouches while maintaining the swimming animation. You have to break a block to escape this state. I have included a link to a video showing you the issue since the file is too large to attach. Good luck!
https://youtu.be/-K8j8o3fNnM
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However, this issue has been closed as a Duplicate of MCPE-32478.
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