I'm testing out adding CarPlay support to my app and had a lot of trouble getting the CarPlay simulator(the one accessible through I/O->External Displays->CarPlay from the simulator app) to respond to any touches.
At first I thought it was a problem with my app, but then I erased all contents and settings, turned on car play, and attempted to even interact with the default view to no avail. Throughout the morning it's worked on and off so something is not right here.
Xcode 14.2, iOS 16.2. As you can see from the screenshot there are no other apps installed.