This is a bit odd. I think it's a bug, not some tag mishap (I checked with MusicBrainz Picard), but in case I got it wrong, please move it to the question sub forum or wherever you think it'll be more appropriate.
I listened to Steven Wilson's Hand. Cannot. Erase. (wonderful album, btw) when I realized I haven't listened to Porcupine Tree in a while. So I went to add In Absentia to the playlist and this is how it looked, the 1st CD was missing:
It's missing just in this view, if I switch to the Albums Cover view, all the tracks are there:
Switching back to Artists view, If I search for one of the missing track titles, say Prodigal (I have the
Search Results -> Always Show the Entire Album checked) it does show up correctly. It shows up correctly also when I search one of the 2nd CD tracks, like chloroform.
I tried removing all the custom virtual tags for sub headers and grouping but that didn't make any difference (the screenshots, above, were taken after I returned my custom virtual tags back on). Under Sorting/Grouping, an album is defined by Album Artist and Album Name.
For some reason, it's just this one album that I know of that has a CD missing when using the Artists view.
MusicBee 3.5.8516 / Windows 10 (64-bit) / Intel i5-3470 / 8GB RAM
Media on NAS (CIFS share)
20K+ tracks, predominantly FLAC ; converted to mp3 (lame -V 0) when synced to a Cowon D2+
________________________________________________________________________________________________
Get the latest patch:
https://getmusicbee.com/patches/