With any type of Minecart, if you go into Spectator mode while the minecart is moving or after it has been moved on rails and left-click on the minecart to see its perspective, your camera view will start to shake rapidly until you leave the perspective of the minecart.
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-99556, 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.