Related to https://bugzilla.wikimedia.org/show_bug.cgi?id=57512
Templates in the header area are *especially* expected to automatically update, when the template itself is changed.
Main explanation for the current behaviour, is at https://www.mediawiki.org/wiki/Flow#Known_issues
Trello card: lxXum3pJ
- column: Send to Phabricator - Collaboration-Team board