Thanks for the samples. Looks like ffmpeg is only picking up the first one, I’ll have to investigate a bit further to see what’s going on.
I can also confirm with ffprobe that only the first value is read.
Input #0, mp3, from '06 - True Romance.mp3':
Metadata:
title : True Romance
artist : Sophie B. Hawkins
track : 6/11
album : Whaler
disc : 1/1
date : 1994-07-26
genre : Rock
TMED : CD
TLEN : 143333
publisher : Columbia
TDOR : 1994-07-22
SCRIPT : Latn
ASIN : B0000028XW
album_artist : Sophie B. Hawkins
WORK : True Romance
originalyear : 1994
encoder : lame.exe -b 320 -ms
BARCODE : 074645330020
CATALOGNUMBER : CK 53300
Writer : Sophie B. Hawkins
ARTISTS : Sophie B. Hawkins
MusicBrainz Album Type: album
encoded_by : Exact Audio Copy (Secure mode)
MusicBrainz Album Status: official
MusicBrainz Album Release Country: US
TIPL : engineer
MusicBrainz Work Id: 62d1637a-fb87-4e65-91e4-f39dd2097be8
MusicBrainz Album Id: 80768e15-d845-3a59-9e05-0de86585b142
MusicBrainz Artist Id: fd7a8bc1-1b25-4b4c-b899-8f7b3343a229
MusicBrainz Album Artist Id: fd7a8bc1-1b25-4b4c-b899-8f7b3343a229
MusicBrainz Release Group Id: 3bbcb74c-0db9-389d-8d4f-2c36a311d190
MusicBrainz Release Track Id: eaaf39a3-8287-3b9e-911b-f6b9c5b199b8
TMCL : drums (drum set)