Backdrops don't work for music albums

[Przemek p]

This sounds like a bug.  I was able to reproduce.  Submit a github issue and I will comment on it.  Make sure you provide your logs.  The github issue you linked never provided additional information.

https://github.com/jellyfin/jellyfin/issues

Thank you for testing it. I submitted the issue here, hopefully it's detailed enough. I couldn't find an ffmpeg log.