This is what I have noticed recently, since the Home Bar is always there, it is leaving the mark on screen For now, this seems temporary, when I enter the app switcher, there is slight shadow where the bar was, but it slowly fades, it needs about a minute to fade completely, so this is not a burn in. At least not yet. I believe that with time, this is where the burn in will be permanent. There is no need for that bar to be always there. I hope Apple realized this already, and they are working to implement the fix.