Not necessarily related, but FYI; We took delivery of a new Cayman GTS 4.0 last November. Shortly after getting the car to Chicago we had some condensation in the LED taillights.
After freaking out I learned that these lights can’t be completely sealed because of changes in atmospheric pressure and changes in altitude they need to be able to equalize the pressure inside. During the several weeks sitting at a German port and on its ocean cruise to the US the high humidity will penetrate the housing and when the temperature drops below the dew point… condensation.
I drove the car with the lights on for a couple days and the condensation cleared. It hasn’t reoccurred, but she lives in a heated garage and the humidity in the Chicago area isn’t as bad as say the gulf coast.
I suspect the lights would have to be exposed to humidity for an extended period of time for the humidity in the light to equalize with outside air and the temperature would then have to drop below the dew point. A car wash was not long enough to recreate the problem on the Cayman even after 90 minutes at a very humid indoor wash/detailer and then taking the car out in 35F.
BTW, if you’re in the Chicago area and like to hand wash your cars, this is an alternative to the automatic car washes with brushes, especially when it gets cold:
https://www.baysatcsw.com
Hope this might help.