Trying to approve https://musicbrainz.org/edit/43460002 gives an ISE:

Caught exception in MusicBrainz::Server::Controller::Edit->approve "Failed query:
'INSERT INTO release_group_secondary_type_join (release_group, secondary_type)
VALUES (?, ?), (?, ?)'
(246301 1 246301 2)
23505 DBD::Pg::st execute failed: ERROR: duplicate key value violates unique constraint "release_group_secondary_type_join_pkey"
DETAIL: Key (release_group, secondary_type)=(246301, 2) already exists. [for Statement "INSERT INTO release_group_secondary_type_join (release_group, secondary_type)
VALUES (?, ?), (?, ?)" with ParamValues: 1='246301', 2='1', 3='246301', 4='2']
at lib/Sql.pm line 115.