I am also having the same issue. Would appreciate any assistance if anyone knew how to fix. Several of my new nav items are not displaying the selected background after being clicked so I wind up with nav items selected while the home link is still selected and that can get confusing.
I tried adding a class using the nav item attribute feature and adding the class .p-navEl.is-selected but it just made it always selected. It's supposed to be in an upper div class when it's selected that does not appear once clicked. If someone knows how I can fix a nav items background when it's selected let me know. Kind of odd as I didn't expect this on a new nav item