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Bug
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Resolution: Fixed
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Normal
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None
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None
See http://musicbrainz.org/edit/26569814 - http://beta.musicbrainz.org/edit/26569814 does work fine though, so there might be nothing to fix.
FWIW, this is one of the beta-entered release merge edits that gave an error (but not an ISE) in non-beta before the last release.