[Plugin: Jetpack] Photon doesn't support custom cropped thumbnails

Hey there
I’d really like to use the CDN Feature Photon (included in Jetpack), unfortunately it doesn’t seem to check if my thumnails are custom cropped, which they usually are. I thought this was added / fixed in the latest Version, but it still doesn’t work for me.
My blog is http://wp7app.de, the Feature is currently turned off, as this issue is a dealbreaker.
Does anyone know how to fix this?
Thanks