I have a release where one singer has multiple credits (roles, as it is an opera release), but in the same vocal: https://musicbrainz.org/release/e49905a5-4fcb-4303-bd2b-29bdeb4c075c

I would like to add all these roles at once, but what happens is the following (for a singer):

I select the correct artist and the correct type

I select the correct vocal and add the role as 'credited as'.

I go to the next row and add the same vocal and add a new role as 'credited as'.

When I now hit 'Done' it adds the first role with voice and role correct, but for the second it adds only the voice, not the role and for any further roles not even the voice is added.