It is difficult to know which is the active tab 'chip' in the compact layout. It has a bit of a darker background, but it is very subtle and not very intuitive. I keep closing the active tab thinking it is one of the inactive tabs. I think it could be fixed by making the background of the active tab chip clearer instead of darker. It could even be completely clear with a border, just like the URL textbox.
It's not necessarily a feature but a UI improvement. By making the active tab 'chip' stand out in the compact layout you make it more convenient, more usable, more dependable.