Can't delete Questions from Question bank

WARNING: We will be doing some database manipulation to setup the issue observed, which will break the quizzes in the course used. Use a new course, or better yet, a Moodle install you can just nuke when done.

1. Create a new course
2. Note the id of the course
3. Create a quiz and add a question to it
4. Run the following SQL, but replace COURSEID with the id you noted above
   3.11:

   UPDATE mdl_quiz_slots qs

   SET questionid = 0

   WHERE qs.quizid IN (

   SELECT id FROM mdl_quiz q

   WHERE q.course = COURSEID)

   4.0:

   UPDATE mdl_question_versions

   SET questionid = 0

   WHERE id IN (

   SELECT qv.id FROM mdl_quiz q

   JOIN mdl_quiz_slots qs ON qs.quizid = q.id

   JOIN mdl_question_references qr ON qr.itemid = qs.id

   JOIN mdl_question_bank_entries qbe ON qbe.id = qr.questionbankentryid

   JOIN mdl_question_versions qv ON qv.questionbankentryid = qbe.id

   WHERE q.course = COURSEID

   )

5. Now back in Moodle, in any course, create a question in the question bank
6. Attempt to delete it
7. Confirm the question has been deleted