RecursiveCallbackFilterIterator regression in 8.1.18 #11972

<?php

class RecursiveFilterTest {

  public function traverse(array $variables): array {

    $array_iterator = new \RecursiveArrayIterator($variables);
    $filter_iterator = new \RecursiveCallbackFilterIterator($array_iterator, [
      $this, 'isCyclic',
    ]);
    $recursive_iterator = new \RecursiveIteratorIterator($filter_iterator, \RecursiveIteratorIterator::SELF_FIRST);
    $recursive_iterator->setMaxDepth(20);
    foreach ($recursive_iterator as $value) {
    
      // Does stuff here...

      // Avoid recursion by marking where we've been.
      if (\is_object($value)) {
        $value->{'#override_mode_breadcrumb'} = TRUE;
      }
      if (\is_array($value)) {
        $value['#override_mode_breadcrumb'] = TRUE;
      }
    }
    return \iterator_to_array($recursive_iterator);
  }

  public function isCyclic($current, string $key, \RecursiveArrayIterator $iterator): bool {
    // Skip closures.
    if ($current instanceof \Closure) {
      return FALSE;
    }

    ########### Debugging code ################
    static $i = 0;
    $i++;
    if (is_array($current)) {
      // When $i > 319 calling isset causes the process to hang and you have to restart the webserver to get out of it.
      $this_fails = isset($current['#override_mode_breadcrumb']);
    }
    ###########################################

    // Avoid infinite loops by checking if we've been here before.
    // e.g. View > query > view > query ...
    if (\is_array($current) && isset($current['#override_mode_breadcrumb'])) {
      return FALSE;
    }
    if (\is_object($current) && isset($current->{'#override_mode_breadcrumb'})) {
      return FALSE;
    }
    return TRUE;
  }

}

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$test_class = new RecursiveFilterTest();
$test_class->traverse($classes_removed_variables);
echo "Completed.\n";