Can you migrate to a standard docker setup. Both the Unraid and Synology "community" versions of Jellyfin have odd bugs that don't exist in plain docker installs.
Jellyfin 10.10.3 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)