Late update: https://www.quantamagazine.org/how-many-numbers-exist-infini...

The bar collapses and then pops up back on ios if you scroll content-up in a non-inertial way.

I can’t remember sadly. But most articles I’ve read in the last few years were from /news or /newest.

The articles on medium.com are common culprits.

Hm, is that really the same thing? It's not doing the "it flaps every time I adjust my overscroll by pulling back, and it covers the text I was trying to adjust".

It may not be such an egregious example as what GP comment was referring to, but it was the first thing that came to my mind. Maybe the Medium UI has improved somewhat since I was last annoyed by this.