I discovered that if I have an album and the tracks are miss numbered like this:

Track 7 numbered as Track 12

Track 13 numbered as Track 15

And then I also have the correct track 12 and 15, so track number 7  & 13 appear to be missing but in reality they are just miss numbered.

Use the "Add Cluster as Release" plugin from Picard and it loads it into Firefox.

Release information tab loads like it should

Track list has the following:

Tracks 7 & 13 are blank. This makes sense as per the track number metadata they are missing from the album.

In my case I had 2 track 12 and 2 track 15. The plugin chose which one of each of these it was going to bring in and tossed the other to that great programmer's black hole, the place we have no clue where it went to.

In my case, it kept what should have been track 7 & 13 and tossed the correct track 12 & 15.

There was no warnings or anything it just decided for itself how it was going to handle a duplicate track/disk metadata.

As a software engineer, I like that it left the tracks missing the track number blank. However, for it to arbitrarily discard tracks, that to me is where the bug is. I understand that for things to be correct you never have duplicate track numbers on the same disk - I don't have the correct answer how to handle this, do we keep the duplicates and place a warning or do we strip the titles of the duplicates as well? That is what I see the question is on how to handle this situation but to just arbitrarily discard a track that is not the way to handle it.

You might say that we need to make sure that all of the album/artist/track/etc. metadata is correct, and I try to for the most part, but in my case I have over 10,000 full albums in MP3/M4A formats and currently am in the process of moving my Vinyl collection to MP3 format. The single arbitrary discarding is not helpful and is a bug that can effect the integrity of the album track information stored.