i have the same issue. it has come off and keeps coming off. the dealer won't do anything apart from offer to order me one at my expense. when it moves it pulls the dipstick out so oil residue goes everywhere.
at one point it moved and slide down the engine slightly. this meant it was on the hot parts and it started to burn. i have taken it out for now, and will be taking it up with seat/other dealers. it could have easily set fire, good job i have a sensitive sense of smell and caught it early.
just to note, i also have the diesel.