I'm having the same issue. Did you ever figure it out?
I even returned the motherboard to no avail.
Specs:
3700x
ASUS ROG Crosshair VIII DARK HERO and ASUS ROG Strix X570-E (BIOS 3604, 4021, and 4203)
G.Skill 8GB*2, DDR4, 3600MHz, F4-3600C16D-16GTZR and HyperX (same error from both)
Gigabyte GeForce RTX 3060 Ti Gaming OC and EVGA 1060 6GB (same error from both)
Samsung 970 Evo Plus 2TB
Corsair HX750i
Update: RMAed motherboard and CPU. Got a new CPU.