[A fellow user by the name of "christopher john" has also described the same issue for a previous version of Minecraft (1.14.3) and the topic was switched to "resolved" however the bug can still be recreated fairly easily]
Issue: After a player gets out of a boat in vanilla Minecraft, they can jump a few times and as soon as they land on a solid block (in this case, either side of the boat) they take damage equivalent to the amount of blocks they jumped and "fell" from despite only falling from a one block height, this bug is similar to the 'lead' item glitch where if a mob is dangled from a block of air and then let down onto a solid block, they take damage.
This isn't such a urgent game breaking bug but a mild inconvenience to anyone who decides to jump in a boat a few times.
PS: I can personally assure you this is a pure vanilla scenario and may not be able to be recreated on other versions/ modded versions of the game.
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-153698, 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.
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