I have this RAM and I load up in to Windows and control the LEDs. Once I get them how I want them I reboot over to MacOS, the LEDs stay the way they are configured in Windows. I have to remove power completely from the system to have them revert out of the configuration.
My apologies I should have been more clear. The SU is what I installed, Apple had pulled the initial release of 10.15.5 before I installed it, so the supplemental update was all that I installed. running fine.
My hope is the drivers that zxystd is working on will eventually get us to a point of having full Mac parity.
This may not be possible but it's what I'm hoping for eventually. I am extremely close to this today with my Z390 build.