Hi,
I am using Pro (and X) and WP Rocket for many years now and I am well aware of problems between WP Rocket’s Delay JavaScript execution feature and burger menus and accordions from Pro (and X). Some time ago WP Rocket build a one-click-exclusion-feature solution for popular third party themes and plugins to help users easily fix this problems by auto excluding the neccessary JS-files. So did they with your Pro theme. The one-click-exclusion is called “Pro Theme - Fix menu and accordions”.
It worked for some time but now I am getting problems with accordions on many of my clients installations even with the one-click-exclusion active. Only safe way is to completly disable Delay JavaScript execution. So I do think that something’s may have changed on Themeco’s side.
So I talked to WP Rocket to get to know what the one-click-exclusion does to pass is over to you for you to may check and maybe you say “ah yes, one file changed, you may have to exclude this and that” 
so here we go, it’s currently excluding these:
/jquery(-migrate)?-?([0-9.]+)?(.min|.slim|.slim.min)?.js(?(.*))?( |'|"|>)
/pro/cornerstone/assets/js/site/cs-classic.(.*).js
Would be great if we can figure it out together. I would pass the information back to WP Rocket for them to update their exclusion list. Thank you!