Header Navbar Responsiveness Broken

I noticed the responsive changes do not "undo" anymore. Try this, on a desktop, shrink the window so the Private Messages and Notifications collapse down to just icons. When you expand the window back out wide again, they do not switch back from icons into full text again. The same for anything that collapses responsively on the left side of the navbar too, nothing there returns to its original design when re-expanding the window back out to normal size.