SOLVED: Moved trickplay-files don‘t get recognized

[Strike]

There is no older version of trickplay. You are thinking of Jellyscrub which was a 3rd party plugin.
The built-in trickplay stuff works with what is currently built into Jellyfin.

To fix this, you need to use the task in the dashboard to move them.

Thanks, I migrated them manually back into the media folders and just started the task.
Now all the trickplay files are in the metadata folder. I wish I knew earlier about the task, it's so handy.