gnattu mentioned that it may be due to the container it is in and suggested remuxing to an MP4 container for testing. Since some players prefer/require MP4 for dolby vision.
Jellyfin 10.10.1 (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)