i had this a couple of years back and the misfire was only counted above 4000rpm, measured running compression with WPS500 over a long timebase and you could quite plainly see the cylinder compression drop with rpm increase. We advised customer of known issue, VW recommend a modified cylinder head and software update but i have heard that a good engine shop can sort it by other means (who knows). Either way, in our case the customer didn't want to spend the money and that as they say was that!

HTH
Craig