When riding in a boat you can exit it by rightclicking on a bed. When sleeping you float down approximately half a block and teleport back up repeatedly.
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-149081, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.