See this release: https://musicbrainz.org/release/e0da89c4-3612-42a3-8f21-3f99872d749e/

When I try to edit it, I get: "Some errors were detected in the data you've entered. Click on the highlighted tabs and correct any visible errors."

Checking the external links, one link is a duplicate. However, I can't remove it and make any new edit to the release.