Cannot install English Nicknames in snapshot dated 8/25/2019

Attempt to install English nicknames results in 500/Internal error status. Error message is "Could not find Primary Link attribute_map_id". This attribute is present in the request URL query values. "/attribute-mappings/install?attribute_map_id=1?mapping=nicknames.en"

Digging into AppController.php "getPrimaryLink", which is called with $lookup=true, It looks like when $this->request->getParam('action') is 'install', both allowUnkeyedPrimaryLink and allowLookupPrimaryLink result in False, meaning that there is no logic that copies the query parameter into the variable $this->cur_pl['linkvalue']  (Line 175)

I put in a hackaround to force this copy and ran into the same impact in AppController.php "setMatchGrid" (Line 255).