Yes. USS-less MY here also.
Guys, service helped me on this one, let me know if this helps you. Go to autopilot, and turn off all the self driving stuff (even if you only have autopilot, like me). Save, then check to see if the feature is there.
For me, I went and disabled autopilot, rebooted the computer (double scroll wheel press until screen restarts) and then went back into autopilot, which was on again, and disabled it again. Once I knew it was off, I checked and park assist was back! I then turned the autopilot features back on and it stayed fixed.
The service person said this often happens, and this is the fix. Let me know if it helps you.