Nested virtualization crashes on startup in 13.3.0

I'm trying to turn on nested virtualization. Whenever I enable it, windows won't start but just gives me the blue 'diagnosing your pc' crash screen. I'm using Windows 10 build 1709, fully updated. I had this problem with MacOS Sierra, but have just upgraded to High Sierra but that makes no difference. I've upgraded to the latest release of Parallels. No difference. I've tried rebooting and fiddling with the Adaptive Hypervisor setting. No difference. I'm paying for the pro version that's supposed to include nested virtualization, since I need it for Docker work.
Looking at the forums, it seems that this was a known problem for Parallels 13.1.0 in October 2017, but I don't see any mention of it for 13.3.0 Have other people got it to work, or did all nested virtualization users just leave parallels in the Fall .