Quiz autosave takes the value of the submit button which had not been clicked

To test this, you need to be confident using the developer tools in your web browser. The attached screen-grabs may help you understand these steps. They show the old buggy behaviour. Go to Admin -> Plugins -> Activity modules -> Quiz, and set Auto-save delay to something short like 5 seconds. Create a quiz with: "Time limit" in "Timing" set to 5 minutes. "When time expires" in "Timing" set to "Open attempts are submitted automatically". "How questions behave" in "Question behaviour" set to "Immediate feedback". Add some questions of a few different types to the quiz (e.g. Essay, Short-answer, Multi-choice, Match and drag-drop markers.) Have the questions all on one page. Start an attempt as a student. Open your browser developer tools and switch to the Network tab. If your site is set to show debugging messages, then you will see useful information about what is going on in the browser console (recommended). Change the answer to one or more questions. After 5 seconds, a new POST request to mod/quiz/autosave.ajax.php should appear in the Network tab. Click on that request to see the details, and find bit that shows the Params that were sent in the request. Verify that list does not contain any values with a name like '...-submit'. Now, close this tab (ignore the form-change-checker warning that you have unsaved data). Wait 5 minutes (for the time limit to expire). Go back in as the student, you should see that the attempt is submitted now. Now log in as teacher and review the student's attempt. Under each question you should see a table showing the 'Response history'. Verify that, where you input a response, the action is shown as Save: ..., rather than Submit: ...