After a clean install of Big Sur 11.4, my usb map kext is not working anymore (I can't see any USB 3 peripheral, port mapping not working, USB 2 works). It was
USB Mapping | OpenCore Post-Install
Serial Port Mapper - Map serial ports to any other port names, swap existing serial ports.
Guide] USBMapping for Gigabyte Z390 Aorus Master with OpenCore 0.6.6. Catalina 10.15.7 - OpenCore Guides | InsanelyMac