My solution was to just highlight the last anchor if the user scrolled to the very bottom. Although this might skip the second last heading if its too close to the bottom.

See here: https://sharezone.net/privacy-policy (most visible on desktop, on mobile you have to open the "Inhaltsverzeichnis" at the bottom)

On large screens I prefer to not read texts at the bottom (I always scroll things enough so I am looking at them at the middle or top of the screen). Also, the positioning of the heading relatively to the screen is always the same on every scroll.

Seems like if you open the "he thinks" image thing at the bottom, and then go back to the "beautiful" result, then it no longer works and the Conclusion heading doesn't get activated. That's how I reproduced it anyway.

Which might be an approach for the first few examples.

I am sure there are other cases that would need anchors.