Yesterday we were out most of the day with a 500 + road trip. One of the Superchargers we stopped at, I cleaned the windshield. later on I was in town and maybe at a red light and engaged autopilot. The wipers came on and it also used the washer fluid. Karen and I looked at one another as if what the heck is this all about. She knows I never like using the wipers and washer fluid because well, the windshield looks crappy afterwards. Why this was a thing and why not long after I cleaned the windshield I have no idea. Now after typing this, maybe there was a bug near the camera. Really can't see that spot from inside the vehicle.
As a reference with our 2018 model X. When I would experiment with smart summon the wipers would always come on for a few passes but never use the fluid.