The artwork template on Commons ( https://commons.wikimedia.org/wiki/Template:Artwork ) has some fields like "demo", "other_fields" and "wikidata_cat" that shouldn't be added under normal circumstances. The GLAMwiki toolset adds these fields and this is causing incorrect behavior of the template ("wikidata_cat" disables the Wikidata tracker categories).

It looks like the GWtoolset is using the templatedata fields to determine what fields to add. We need some way to filter out some of these fields.