Anonymous users cannot jump to questions

We've encountered an issue with Quiz where anonymous users are unable to properly jump around a quiz.

Summary

Steps to reproduce:

• Create a quiz that allows anonymous users access and allows jumping with 3 or more questions.
• As anonymous, take the quiz and attempt to jump from question 1 to N (where N >= 3)
• Expected result: Question N is displayed
• Actual Result: Question 2 is displayed

Cause

I found that the issue is in quiz.module in quiz_take_quiz() on line 2004:

    // If anonymous user, refresh url with unique hash to prevent caching.
    if (!$user->uid   && $q_passed_validation === TRUE) {
        drupal_goto('node/' . $quiz->nid . '/take', array('query' => array('quizkey' => md5(mt_rand() . REQUEST_TIME))));
    }

This code prevents caching of the quiz for anonymous users, however it also issues a redirect before the jump can be acted upon on line 2034:

  if (isset($check_jump) && $check_jump) {
    if ($quiz->allow_jumping && _quiz_is_int($_POST['jump_to_question'])) {
      quiz_jump_to($_POST['jump_to_question'], $quiz, $_SESSION['quiz_' . $quiz->nid]['result_id']);
    }
  }

Workaround

Commenting out this line remedies the issue, however I don't know if this is an appropriate solution, as a hash is added to te URL, however it does NOT change with each subsequent request.