Go to /etc/jellyfin. Open logging.default.json. Set "Information" and "Warning" to "Debug". Restart Jellyfin. Replicate the problem and share the new log on pastebin.
Jellyfin 10.10.7 (Docker)
Ubuntu 24.04.2 LTS w/HWE
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
4x WD Red Pro 6TB CMR in RAIDZ1