I tested this patch manually on Drupal 9.2-dev (as of today) on PHP 8. I test...

I tested this patch manually on Drupal 9.2-dev (as of today) on PHP 8. I tested with installing Umami and then randomly clicking through the site and in admin panel. No errors reported anywhere. Some screenshots in a Twitter thread at https://twitter.com/hussainweb/status/1317449063533600770 and the test code is at https://github.com/hussainweb/drupal-php8-composer2.