Storyline block goes white/blank on a Rise lesson in preview mode

Hi, I have a storyline block in a Rise course. In Rise- in edit mode, or preview mode or when shared for viewing, the interactive SL block loads fine when the lesson page loads. If you scroll up or down or go back to the main menu then back to this page--the storyline block is white/blank.  To reproduce it, just publish the storyline file to review 360 and link it to an interactive block in Rise. 

Scroll up and down a few times on that lesson page and eventually, it will go blank/white.