Issue with Jellyfin Plugins and Folder Display in Docker Containe

[ElGustago]

Just looked over your docker compose again.  It is NOT required that you create a separate volume just for plugins, they would go in /config.

Thank you for the hint. 
I did it this way due to the issue, just to temporarily move the folder elsewhere for testing purposes. I forgot to change it back.

I deleted Jellyfin and reran the Docker Compose file without the plugin path. 
Unfortunately, the same problem occurred again. 
After restarting, the plugins disappear. 
I have to reinstall them, restart the container, and then it works until the next server restart.

Is this behavior possibly normal? 
I don't encounter any issues with other Docker containers.

Thanks for your help.