[Placeholder] Investigate redirect issues encountered after upgrading to 2.10.x about az_quickstart

[jfallen19]

First noticed May 31st. Most recent major change was a version upgrade from 2.9.5 to 2.10.2 in May 15th. Became more common.
--Issue Description
The web page will appear as a generic "White Screen of Death" - a white screen that says "The website encountered an unexpected error. Please try again later." However, you can view the edit page as normal, and there's no errors or issues with the page or content. Check for the Automatic URL Alias path, and the URL Redirects, and see if they're matching. In your reports and logs, you might see a PHP error mentioning a Redirect. The affected links were created a few years ago during our migration from Quickstart 1.0 to Quickstart 2.0.

If you think your site is affected and you're a web server admin, run this select code and check the paths on your site for similar issues.

select r.redirect_source__path, a.alias from DATABASE.redirect r
inner join DATABASE.path_alias a
on r.redirect_source__path like substring(a.alias, 2, LENGTH(a.alias)); 

--How to fix
Remove the duplicate URL Redirect and save the page. (Note: This will not make a Revision, so be sure to back up your work first.) The paths and redirects should be working as normal now.

--Relevant links by the team:
https://www.drupal.org/project/redirect/issues/3401916
https://www.drupal.org/project/redirect/issues/3096948
#3345