A/V sync issue that only happens in jellyfin

[MentalUproar]

Code:

podman exec -it Jellyfin bash
cd /media/TESTING
/usr/lib/jellyfin-ffmpeg/ffmpeg -fflags +genpts+igndts -i "./TEMPY.mkv" -map 0 -codec copy -max_muxing_queue_size 2048 -max_interleave_delta 0 -avoid_negative_ts disabled newFile.mkv

I ran the above.  The remuxed file does not have AV sync issues.  It seems to only happen inside the browser on the jellyfin interface