With Chrome on Mac OS, going back in browser history loses vertical scroll position with infinite scrolling themes. I notice this when browsing gallery themes like Cubic, pictured.
Losing vscroll every time you go back is frustrating enough to abandon a session. Thankfully, iOS Safari and Macnfirefox don’t lose vscroll. Firefox preserves vscroll when going back, but you have to wait for all of the posts to reflow. It’s a bit clunky, but scroll position is preserved. iOS handles back nav smoothly. Here’s iOS in action.