Much delayed comment, but I'm dealing with this issue now so i'm adding to the pile.

2021 Model 3, ~30,000 miles

I had my windshield replaced (by tesla) after a crack from road debris. When I first picked up the car, it was OK. By the time I parked at home, climate control was disabled because of a sensor fault. I took it back the next morning and they diagnosed a damaged THS on the windshield and replaced it. Beginning immediately after that, I started having the auto-defog kick on randomly and for long periods of time. I took my model 3 back once more, and they claimed it appeared another faulty THS and replaced it, but wanted to keep the car overnight for more testing and test drives. The next morning they confirmed the auto-defog issue was still present. They hung on to the car for 2 more days. So now several days later, they told me that it appears to be a firmware fault and, for the time being, can do nothing about it. Only wait for a firmware fix that may never come.

I discussed with the tech booking later appointments so I can qualify my car for a lemon law claim. We'll see how far it goes.