When adding a label-release relationship in the relationship editor, the order is currently:

• business association with
  • promoted by
  • manufactured by
  • distributed by
  • publisher
  • copyrighted by
    • phonographic copyright by
    • licensed from
• rights society

Each part of the tree should be sorted by child order first, then by name for things with the same child order, like on https://musicbrainz.org/relationships/label-release but that doesn't seem to be the case.