I've reported that the system-sleep tearing on 1060s appears present and possibly worse on High Sierra with the new web drivers, at least that is my experience on my system. This issue affects the system after it goes to system sleep (not display sleep) on 1060s and some folks can resolve it with display-sleeping while others appear to need to reboot. On my system it's worse because after sleep both monitors flicker and tear and on the one time I tried it I lost the mouse cursor completely on the second monitor requiring a reboot.