When the minecart is halfway between a column of water powered by soul sand and rails, the minecart begins to oscillate.
New experimental setting "Minecart Improvements" on.
Sorry for bad english, I hope the moderators can understand the issue and that I can help as best I can.
Edit : it seem to also affect the player.
Thank you for your report!
We're tracking this issue in MC-275229, so this ticket is being resolved and linked as a duplicate.
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