the shortcut 'esc' key used to be assign to 'back to tab' function of picture-in-picture. it calls back the tab even if the window is minimized or during the view of other tab. it is very useful. now, it is no more different than 'close'. the picture-in-picture just disappear.
reassigning back previous 'esc' key shortcut to 'back to tab' would be very helpful.