Does it only happen when you restart Jellyfin? How are the libraries accessed by Jellyfin? Are you mounting volumes directly from the NAS into the container? Or as SMB shares?
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)