Someone just posted over on the Macrumors article about this:
jbellanca said:
I find it interesting that no one's mentioned the one thing that
maybe indicates it
might be software not hardware – when you open up a side list, like the list of emails in Mail, and scroll just the list on the left side, it ALSO exhibits this behavior - there's jelly WITHIN the small list, all on the left side of the screen. If it were the display controllers, I don't think this would also be happening.
I wrote about this a few pages back. I think this gets the heart of the potential issue and suggests software may be to blame, why does the “jelly “ effect still happen in discreet parts of the screen - in this case when scrolling
only the lefthand side bar of Mail, or Apole News etc 🤔