Sorry to jump onto this issue two years after the last activity. I’m using Symphonium with Jellyfin since recently and I’m confronted with the same problem as OP. Since I have not found an issue logged with the listenbrainz-plugin on github, I’d like to do that.
From what I understand, the plugin requires the playback position to be submitted alongside the item
I understand that (possible) offline playback is the reason for submitting the “0” value for PlaybackPositionTicks by Symphonium? Why is that? Can you help me understand so that I can open a ticket with the plugin authors?