I completely understand venting vs wanting solutions…
But sometimes I can’t help myself. There are a whole host of things that could cause this. Happy to suggest things to test if you want, or there’s an easy way to try an alternative. Have you considered giving Jellyfin a shot?
The spondylolisthesis (listhesis) one isn’t quite accurate - it should be the whole spine above the joint in question shifted forward. You don’t really see just one vertebral body sticking out like that.