Per title, some(?) relationships are not considered valid in the Release editor, when multiple date ranges are present.

E.g. Spiritual Bankruptcy https://musicbrainz.org/release/af1e387f-c742-4222-8900-13e3a11d0c2f

The URL editor allows adding multiple date ranges: https://musicbrainz.org/url/8fd5f018-07ab-4ceb-a3ee-b185418221cb

Yet, the release editor will display an error if this is the case, and will not let any changes proceed: https://musicbrainz.org/release/af1e387f-c742-4222-8900-13e3a11d0c2f/edit

Aside: The release page Credits incorrectly disables the URL if an "ended" date range is present, despite there also being a "to present" range.