Facts. You have to forgo native scrolling and basically re-implement all desired scroll behavior in JS in order to get rid of fixed position scroll jank.
I've been interested in re-implementing smooth scrolling in JS to mimic native but.. Even if you hit solid native refresh at all time, I feel you'd have to switch your entire site to JS controlled scrolling for consistency and even then the scroll feel might not match native scroll on other pages per system settings.
Never override scrolling in this way. Scrolljacking is always bad, because the web doesn’t expose the primitives required to make it anything else. You might be able to get it to match the platform you’re on exactly, but it will still be a trainwreck for many other users.
I've been interested in re-implementing smooth scrolling in JS to mimic native but.. Even if you hit solid native refresh at all time, I feel you'd have to switch your entire site to JS controlled scrolling for consistency and even then the scroll feel might not match native scroll on other pages per system settings.
It's a bit of a rabbit hole.