I think every BIOS these days can be considered beta 🙂 Found and reported Bugs have to constantly be fixed and Intel redesigning power limit TAU or turbo boost timers... The true beta bioses tend to be internal builds, AFAIK.
Using a plain Dell USB keyboard attached via the Aten CS1784A kvm. Keyboard setup works well with all other Asus mobos used so far.
On the Z490 Hero WiFi model, still getting occasional "keyboard not found" USB errors in BIOS only with all the BIOS versions tried - 0222/0503/0509/0606. 100% successful workaround is to unplug and replug into the other USB2 port when that happens, minor issue but annoying nonetheless when changeing BIOS options.