running 10.15.7 on nuc8i5beh, efi based on leisureone's files, but updated with recently current kexts. Bios is 071 (BECFL357.861.0071.2019). Only issues I have seen is. 1) updating appleALC beyond version 1.49 causes loss of sound (I think I have to update config.plist), and updating clover beyond 2122 caused boot failure (looks like 2123 is the start of the opencore intergration for big sur, and other threads have recommendations on changes to do when moving to that)