Same problem here ASUS PRIME X470-PRO. Older versions show the ram up in ICUE. Newest bios (4207) doesn't show the ram in ASUS AURA or CORSAIR ICUE. There is no DRAM SPD Write option (not sure if this has to do with it).
This really will be a problem in the future, especially with the 3rd gen Ryzens coming out (meaning it will require the latest BIOS to be able to handle the new CPU's with these motherboards).
I've created a ticket through CORSAIR and ASUS for this.