USB3 not working, even with port map, on otherwise perfect Big Sur Clean install on OC

I performed a clean install (and post install time machine backup) of Big Sur 11.5.2 with OpenCore on a machine I had previously running with Mojave and Clover. Everything seems to work perfectly apart from the USB3 ports which seem to not be working/detected with any USB device, but do show up in hackintool and system report. The devices and ports work under Windows and my old Mojave install.

I used a (now slightly modified) EFI specifically designed for my board by a maintainer...

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Author: theimadman