Quiz slides sometime shows Prev/Next and not Submit

I figured out the trouble. The issue occurs when the project is posted in the LMS and:
- the "Resume where you left off" option is implemented
- the Quiz properties are set to "Automatically decide"

1. I run the lesson and select 2 random questions.
2. I exit the course.
3. I run the lesson again and click Resume.
4. The 2 slides I previously answered show only Prev/Next. I believe this is the expected behavior.
- The first slide lets me click Next, but not change my answer.
- On the second slide, Next does not work. I had to go to the Menu to proceed.

The way I have coded my course, each mini-section ends with a quiz (there are a dozen of these). The Correct/Incorrect layer of the final quiz slide is coded to take the learner back to the Main Menu after viewing their success/failure.

- If I set the Quiz slide to "Reset to Initial State", I get the Submit button, but I have to answer the question each time I revisit the slide.

- How can I get the slide to show Prev/Next when visited, but have the "Next" button (that only appears at that time) correctly take me to the Main Menu?

Thank you!