Hmmmm. The Intel Quicksync wiki says it should support some VP9 decoding on the GPU. Go ahead and uncheck VP9, though. Unchecking it just means it will decode the video on the CPU.
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)