Beats Kodi.

Are you hellbent on using Jellyfin? It’s basically a Kodi for dummies where they removed the best parts, kept the worst and and slapped on a pretty ui. It’s bloated behind the scenes and does have it quirks.

An alternative could be to just set up an NFS share with your media and use whatever player you like. Nova video player on Google/Android TV isn’t as pretty as Jellyfin but it gets the work done.

I’ve had zero issues with Infuse on apple tv. Easy to navigate, looks good and plays stuff on my network shares. I think there is support for adding a Jellyfin library as a source as well but I haven’t tried it.