I have a 10-stereo demonstration record. It is on discogs as
The discogs listing WAS missing lots of information, and didn't accurately reflect the number of tracks, artists etc. So I fixed that.
The record has an introduction track that is not listed on the sleeve or labels. Rather than change the A1/B1 etc which would mismatch the labels, I just added a "-" for the new track number. Time will tell if discogs allows that, the guidelines are not clear. Database Guidelines 12. Tracklisting – Discogs
Anyway, I tried to use mp3tag to tag the tracks, and it returned no tracks when using Tag Sources/Discogs ReleaseID [r4712359]
You can see the mp3tag and discogs entry in this