N8 -> AAF -> PT12 Crossfades no longer linear

Hey there,
When exporting Audio via AAF, my linear fades (Nuendo 8) turn into equal power (non-linear) when imported in Pro Tools. When I import the AAF back in Nuendo 8, the crossfades are still linear. Fade in/out stay linear btw.
It´s a win10 system. I didn´t have this issue with Nuendo 7 on a Mac. Is there a workaround to keep the crossfades linear without using AAFtranslator?
Thank you very much!