Issue #3292255 by Steven McCoy, szymon-gorecki, darvanen, kalpaitch: Can't...

    if ($config->get('preserve_destination')) {

      // Get current destination value.

      $drupal_destination = $this->requestStack->getCurrentRequest()->query->get('destination');

      if (UrlHelper::isExternal($drupal_destination)) {

        $drupal_destination = NULL;

      }

      // Determine if a destination exist in the URL.

      if (!empty($drupal_destination)) {

      if ($drupal_destination && !UrlHelper::isExternal($drupal_destination)) {

        return;

      }

    }