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In general, any calls you see in your network tab under "b/ss" is considered a primary server call. Adobe doesn't distinguish between primary and secondary server calls any longer.

Assuming you have Adobe Analytics on all your domains, I would strongly recommend that you get this plugin:

https://marketing.adobe.com/resources/help/en_US/sc/implement/getPreviousValue.html

And start parsing the previous page name to a traffic variables and associate the  s.getpercentpageviewed function with the call. That way you can be sure that there is always a previous page name associated with the scroll tracking.

hope it makes sense.