when I place sea pickle, kelp, or sea grass underwater they immediately despawn and float to the surface. I can place the sea pickle out of water then put water DIRECTLY on it for the sea pickle to work and not despawn. Even after using bonemeal, everything immediately despawns.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-32920.
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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