Apparently it’s fairly common , my van is a 2018 Pegasus GT70 Rimini and last year I had tourershine come to give it a good clean and he pointed out to me the exact same thing, he told me it’s shown up on numerous vans in this place, on mine it’s pretty difficult to notice unless your looking and the guy who was cleaning mine assured me it was cosmetic and only the decal and nothing going on underneath it, he is of the opinion it’s because it’s location is such that it gets full heat from the sun.
BP