Maybe it's a Linux thing?
I've been using it on Windows for years with multiple devices and it's been working flawlessly.
Could be, but it also had problems on my mac. I had to abandon Jellyfin for Emby over it.
Every so often, Jellyfin would choke ingesting a video. Worse, it would hang the whole ingestion process, so videos later in the list wouldn't get processed. Restarting didn't fix it, either, I had to delete the problematic video (which notably, played ok in things like VLC and IINA).
It has worked flawlessly for me on Linux.