Continue Button - Complete All Blocks Above

We're challenged with LMS reporting really fast course completions - a learner can basically complete a fairly extensive course in under 2 minutes by just clicking through the content. While restricting navigation is always an option, we struggle with the idea of sacrificing user's freedom to access the content they want whenever - this is a large part of user experience.

I just recently discovered this feature with the CONTINUE button. We like that you can still browse through the content but the learner has to really complete all the blocks. That said, after testing.. for lessons with primarily "text" and "images" (no interactive blocks) - - - it's not marking the lesson complete, even after spending what I would consider a substantial enough of time to read through the content. It still tells me to "complete the content above before moving on". 

How does it track completion of the lesson blocks? Am I missing something?

Donna