If you start swimming and hit an entity for the first time while swimming you would stop swimming for a second on a client, but not on a server, desyncing the player position between the client and server.
Steps to reproduce:
Set your gamemode to creative mode
Teleport to a nearest ocean monument
Give yourself a sword and start swimming near the edges of a monument while attacking entities.
Eventually you would get stuck, even though you're not touching any blocks
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[Mod] Jingy
Arisa Bot
Thank you for your report!
We're tracking this issue in MC-129568, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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kelianor
This is already tracked in MC-129568