added clear => to the token replacement.

alt_login.module

@@ -32,15 +32,16 @@ function alt_login_user_format_name_alter(&$name, $account) {
   if (!isset($names[$uid])) {
     // Anonymous users
     if (\Drupal::currentUser()->isAnonymous()) {
+      $anon = \Drupal::config('alt_login.settings')->get('display_anon');
       $names[$uid] = \Drupal::token()
-        ->replace(\Drupal::config('alt_login.settings')->get('display_anon'), ['user' => $account]);
+        ->replace($anon, ['user' => $account], ['clear' => true]);
     }
     // Do the replacement if the module is configured.
     elseif ($template = \Drupal::config('alt_login.settings')->get('display')) {
       if (!$account instanceof UserInterface) {
         $account = User::load($account->id());
       }
-      $names[$uid] = \Drupal::token()->replace($template, ['user' => $account]);
+      $names[$uid] = \Drupal::token()->replace($template, ['user' => $account], ['clear' => true]);
     }
     // If the above didn't produce a string or isn't configured, fall back to the username.
     if (empty($names[$uid])) {