"self" string inside syntaxhighlight tag breaks OCG (pdf rendering)
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I created some test pages at https://en.wikitolearn.org/User:Mapelli_Dario/Test.
Whenever the self keyword appears, OCG breaks.
I tried with some other keyword from https://www.w3schools.com/js/js_reserved.asp , and they do not break OCG.

I deeply and truly thank @davidev for finding the problem!
It seems that he added otherkeywords={self,this} to some option for rendering the code. He promised me a fix during the next days, we hope

Let's see if the patch works,..