Adding examples to https://musicbrainz.org/relationship/535fdfed-3bca-40ad-966b-e67be7882d09 works, but only if searching for artists - searching for works (cardinality 1) does not find anything.

Adding examples to https://musicbrainz.org/relationship/1af24726-5b1f-4b07-826e-5351723f504b/ doesn't work at all (even though only entity1 in the relationship is set to cardinality 1) unless the cardinality for both entities is set to 0.