Navigating to https://musicbrainz.org/release-group/a2f99f9c-12f9-418a-9f84-3059c4e31f4a/alias/24487/delete gives a React error ("Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports."). This has probably been broken for ages, just nobody ever removes release group aliases.