Assessment is set to allow unlimited resubmissions, late submissions accepted for those who haven't yet submitted, record last score. A link has been added in a Lessons page directing to the Assessment using the Add Quiz option. After a student has completed the test once (prior to due date or after it - doesn't matter), they are still able to click the link, The normal 'Begin Assessment' screen appears, but upon clicking that button to begin they are presented with a screen that says 'Late Submission not allowed'. That student's score for the assessment is then recorded as a 0 - overwriting the previous score.

I believe this page's message should be changed to say something like 'You have already submitted this assessment and your score has been recorded.' Additionally, it should not allow them the chance to relaunch the assessment after the Due Date if they have submitted. Finally, their scores should not be replaced with a 0.

The issue has been demonstrated in both Chrome and Firefox.

UPDATE The assessment must have a time limit enabled. It doesn't yet appear that the length of the time limit is a factor, just that one exists.