CD TOC Disc ID and/or Free DB computation bug: Last audio track before data track is 2:30 too long

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Continuing the discussion from Fate of the old forums:

Old FreeDB imports (and maybe Picard and isrcsubmit DiscID as well? I don’t remember) used to have a bug that made the last audio track of an Enhanced CD show a length 2 minutes and 30 seconds longer than its real length.


Edit #2892119 - Add release adds a release with track 9 of length 8:21 and track 10 was a data track (a trailing data session after audio session, not a track, actually).

But in reality, real track 9 length is: 8:21 − 2:30 = 5:51

You can never know if this or that Free DB import or Add Disc ID edit is right or wrong.
But it’s good to know, when you compare with other releases or recordings, that a length difference of 2:30 on a last audio track should ring a bell: Edit #50657905 - Merge releases

I think I used to have a pretty detailed comment (in old forum topic that contained loads of examples, I guess) about that often seen in old added releases bug.
I am waiting for the return of this forum because I have not saved my topics and I have dozens of useful links to it (not saved by web archive).
So I create this topic here because it’s not very clever to always link to dead forum link in my edit notes.