Issue #3276645: Run readiness checks after stored results have been cleared in certain situations

src/Controller/UpdateController.php

@@ -81,6 +81,9 @@ final class UpdateController extends ControllerBase {
       $url = Url::fromRoute('system.db_update');
     }
     else {
+      /** @var \Drupal\automatic_updates\Validation\ReadinessValidationManager $checker_manager */
+      $checker_manager = \Drupal::service('automatic_updates.readiness_validation_manager');
+      $checker_manager->run();
       $message = $this->t('Update complete!');
       $url = Url::fromRoute('update.status');
       // Now that the update is done, we can put the site back online if it was