Why have menu links to extensions eg DataViz, CiviDiscount, LogViewer now give the civi home page
We know one quick fix is to resave the Directory page civicrm/admin/setting/path?reset=1

(Note: we tested with making a minor change then saving but it may work with just using Save)

Looking for other broken sites so I can next test
 civicrm/admin/setting/updateConfigBackend?reset=1