Multidisc albums with more than one artist

[zebra]

I have a 3 disc album called AlbumX. All files from the first two discs have the same artist and album artist (ArtistX). Some files from disc 3 have a different artist (ArtistY) but all files still have the same album artist (ArtistX). Minim shows then two albums:

- AlbumX with artist ArtistX (files from disc 1 and 2 are merged)
- AlbumX with artists ArtistX and ArtistY (files from disc 3)

According to the user guide there should be only one album because the mergeFolderAlbums property is set to true and all files have the same album artist. Is there anything wrong with my configuration?

Code:

AlbumArtist:Remixer
albums=120, Remixer=60
...
Remixer:Albumkünstler,Artist:Künstler,Genre,Date:Jahr
[all].sortValue.ignoreThe,Album.sortTags={Album, Artist}
...
mergeAlbumFolders=true
...