Answers to "drag and drop into text" question type are not displayed during review.

In the review of the quiz attempt (as student or as teacher) with a question type "Drag and drop into text"  the students' answers are not displayed if one of the available choices is used twice.

1. Create a course.
2. Create a Quiz activity
3. Click Edit quiz
4. Click Add a new question link.
5. Select Drag and drop into text.
6. Fill in the form:
   • Question name: Test question
   • Question text: One [[1]] Two [[2]] Three [[3]]
   • Choice 1 Answer: 1 (unlimited)
   • Choice 2 Answer: 2 (unlimited)
   • Choice 3 Answer: 3 (unlimited)
7. Click Save changes.
8. Go to Quiz and click Preview quiz now
9. Answer by using one of the options twice
10. Click Finish attempt and Submit the attempt
11. Check the review: icons (correct/wrong) are visible, but the text of the answer is not displayed.