I am facing the same problem on my iphone Xs ever since the IOS 16 update. I even tried factory data reset but nothing seems to be working. Its barely usable. the way i was able to reset my phone by using two fingers at once for this ghost touch issue. Im just hoping that IOS 16.1 will fix the issue.

After updating to IOS 16.0.2 my “app switcher bar” hardly works and sometimes the screen doesn’t work except assistive touch on my iphone XS