Can I stop Continue buttons disappearing?

I agree with Humberto and Liz above. There is a need from a learners perspective to be able to navigate back to previously visited content but also to continue where they have left off.

I am running into issues where if a knowledge check block has restrictions set to achieve correct answers before proceeding or using a continue divider to complete the blocks above, the learner has the options to revisit previous lessons but are unable to proceed. 

Image below:
Graduated Licencing System:
1. On initial visit has a continue button at the end to complete all blocks above.
2. Continued to next lesson. "What is a ..." 
3. Learner decided to go back to "Graduated Licencing System" did all the blocks again to continue. Continue divider is now gone and learner can not navigate back to "What is a Driver..." and you see the icon below when trying to click on it as well the hover message. 

Using the Navigation button in this case will only add confusion due to the automatic naming configuration as this build will not show as lesson 1 in my 2 part branching. It will continue to name the lesson in the order of the navigation menu.