I have a 2010 VW Passat Komfort. Cylinder#1 spark plug was smashed from electrode side. I changed it out with new NGK iridium spark (same as previous spark plug) plug and did the exact same thing. Is it too long of spark plug , bad fuel injector or the piston itself breaking the spark plug ? With common sense I know all the spark plugs should be damaged if they were “too long” but only Cylinder#1. What could it be ?