http://test.musicbrainz.org/release/512678d9-e1b0-498b-a27f-e7776602f5e5/edit
I'm trying to change "Martin Phillipps & The Chills" to "Martin Phillipps" & "The Chills" (artist credit to two artists).

After I add a second artist to the AC for The Chills the "artist as credited" field has the gray default artist name. When I click on the edit note tab it refreshes the page with an error: "Name field is required." The "artist as credited" field for The Chills is red, so I have to set it manually.

Expected result: It should assume the original gray default for the "artist as credited" field, so there should be no error.