On mobile, the area to the right of the navigation toggle, at the same height that the navigation toggle, can’t be interacted, though the nav button is small and floating to the right of the screen.
It’s badly explained, so, here’s a screenshot. Tap anywhere on the purple area, it won’t do anything. You can try to like, show likes or reactions, copy link, show the replied post, etc… No interaction will work.
I mostly won’t notice it, but my thumb tends to move across this area, and having a “dead touch” from time to time, requiring me to scroll more, bugs me 
I think I won’t create a new topic for this, I’ve noticed after this change the