My drainage hole seems to be without an opening, just like there is a propp where the hole should be. The result is that after rain or washing the car, it is always some water under the gas cap behind the cover to the gas cap.
Not a problem in summer, but in winter time this will freze up to a nice ice block, which might make it hard to open the cover or the gas cap.
How does this drain hole look like in your Arteons? Is it open or does it look plugged? (Does it drain away the water or does it not?)