Wikimedia Bugzilla is closed!

When there are multiple {{Information}}-like templates on a file page (a typical pairing is {{Artwork}} + {{Photograph}}), CommonsMetadata only returns author information from one of them, which might result in misleading attribution texts (e.g. one is PD, the other not, and CommonsMetadata returns the first one).

As an ugly hack, return in a new field the number of authors (i.e. the number of {{Information}}-like templates with author fields). Clients can use this information to show some sort of warning. (Proper solution of this issue will have to wait for [[c:Commons:Structured_data]].)