This is great… Works almost every time 
Some times when I publish, the live site goes nuts and just keeps scrolling, but then I re-publish and it’s all good.
Edit… Just as I was done writing this and went back and published, the site is back to autoscrolling… No matter what I seem to try, I cannot fix it.
I have tried adjusting the margins on the boxes, but no luck.
Edit…
I also see that your example does the same thing 
Edit 3: I might have found a solution. If I edit the page itself and give it a 50px padding to the top, the problem seems to go away.
Don’t know if it’s because of the editor x panel doing this.
Edit 4: Nope… now it’s not working again…
I have done nothing to the page, section size or boxes. But they just randomly stop functioning as they should…
I might suspect it’s a bug at this point.
But I have another issue.
I want to be able to have a header button that sends the user to the top of the page (or reloads the frontpage), but when I link to the same page, it tries to scroll up, but gets interrupted and scrolls down again, when hitting the first section on the way up.