From what I've heard, SQUAD have tried to facilitate earlier crafts, but have stated that some may not work. Maybe try a fresh build? I've honestly not tested 0.21 yet (I'm about to) so this is just speculation. I do find the posts about 0.21 abit ironic though. We have all shouted at squad for the last 3 weeks to release 0.21 and now that it's releasesd, we're complaining about it.