User blog comment:DaNASCAT/Technical Update: Semantic MediaWiki Upgrade On November 3rd/@comment-4738647-20161103153233/@comment-4738647-20161103170508

Yes,

Basically, only articles in Concept:SomeConcept with  in their code should show up in the query Concept:SomeConceptParent:AnArticle; Descendant

But after the update, every page that's in Concept:SomeConcept (and there's cases where there's over 100 of pages in a concept) show up regardless of what's after the semi-colons.