Assignment Grader: If student submitted text, but the instructor hasn't added feedback, message and text incorrect in grader

If the assignment allows text and an attachment, if the student adds text to the assignment, but the instructor has not added feedback, the message displayed when viewing the student in the grader is incorrect and the "Feedback text"  button just displays the student's submitted text.

Text displayed above student's text submission:

This is the submitted text, with your feedback. To add more feedback, click 'Add Feedback' at the bottom of the submission, then click 'Done' when you're finished. Your changes won't be saved until you click one of the save buttons in the grader.