Creating new album with multiple artist credits causes tracks to be credited only to first artist

See the edit history for <URL: http://musicbrainz.org/release/a311391c-107d-4b23-8004-3fe5454e8b27 >.

I created a new album using an uploaded CD TOC.

I credited the album to three new artists (Ken Sweeney, David Carpenter, Tom Hodgson). In the track editing page, I observed that each track was credited only to "Ken Sweeney, " [sic]. I decided not to attempt to fix it in the track editing page, to see if it would do the right thing after submitting the whole album; it did not. I am now correcting the track credits, so please check the edit history for reproduction.