Jellyfin isn’t meant to be some highly available distributed system, so of course this happens when you try to operate it like one. The typical user is not someone trying to run it via K8s.
The effort required to put an application on Kubernetes is a pretty good indicator of software quality. In other words, I can have a pretty good idea about how difficult a software is to maintain in a single-instance configuration by trying to port it to Kubernetes.
[1] https://jellyfin.org/posts/efcore-refactoring [2] https://jellyfin.org/posts/jellyfin-release-10.11.0/