I am seeing this locally as well and the patch in #17 still applies to the latest code in 8.x-1.x branch and the PHP notices go away.
Ok I looked into this more closely and it looks like the old permission is not dynamically set and our issue was the the Views defined in the old version of the module did not have their access settings automatically updated upon upgrading to the 2.x version. Going to close this for now.
I have rerolled the latest patch to remove the changes on file permissions that are not needed (they change two PHP files to have execute permissions).
/admin/config/regional/name/list is the admin path in question, not /admin/config/regional/flexdate/list in the ticket description above.
We had been using this patch for the MTCaptcha module but the patch no longer applies cleanly for the recently released 8.x-6.2 version of the module.