Issue #3262102 by Liam Morland: Only the last role with invalid permissions is displayed

      // Check user roles on the site for invalid permissions.

      $class = 'no-known-error';

      $requirement = [$this->t('None found.')];

      $requirement = [];

      $user_roles = Role::loadMultiple();

      $all_permissions = array_keys(\Drupal::service('user.permissions')->getPermissions());

      foreach ($user_roles as $role) {

        if (!empty($invalid_role_permissions)) {

          $class = 'known-error';

          $status = FALSE;

          $requirement = [$this->t('Permissions of user role: "@role":', ['@role' => $role->label()]) . '<ul><li>' . implode('</li><li>', $invalid_role_permissions) . '</li></ul>'];

          $requirement[] = [

            '#theme' => 'item_list',

            '#prefix' => $this->t('Permissions of user role: "@role":', ['@role' => $role->label()]),

            '#items' => $invalid_role_permissions,

          ];

        }

      }

      $build['data']['#rows'][] = [

          ],

          'status' => [

            'data' => [

              '#markup' => join(' ', $requirement),

              '#theme' => 'item_list',

              '#items' => $requirement,

              '#empty' => $this->t('None found.'),

            ],

            'class' => 'status-info',

          ],