As an example I put 2 folders in unclustered files, the first being tagged with "Disc Number = 1, Disc Subtitle = Bass" the second "Disc Number = 2, Disc Subtitle = Drums: Hats and Miscellaneous Percussion". They also had an artist, album, title and track number tag. Then after randomly selecting sections, clustering them, and submitting it as a release it'll try to enter as 12 media, without medium name, with correct track numbers but in the wrong order (23, 24, 6, 29...). It seems to be ignoring the metadata and instead submitting in whatever order the files are clustered together.