Disconnect all USB devices (except mouse and keyboard) and try to sleep. Maybe, one of USB devices sent signal to wake up.
I have "intellectual" PSU Thermaltake, it has USB-port and windows software (monitoring of temperatures, power consumption etc.), but when it connected to USB macOS can't...
Yo can use the same EFI and make some additional adjustment which you can find in first post of these thread, just scroll post to "Modifications for Z490 Vision G".
I have Z490 Vision G and it works very well.
Open your config in OpenCore Configurator, "Device Properties".
Add new device: PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)
Set "CSM Support: Enabled".
Don't save, don't reboot!
Go to GPU options, now you have option "Initial Display Output", set iGPU.
Set "CSM Support: Disabled".
Save and reboot.
Useful information for iGPU users:
if you need 4K@60Hz on HDMI with iGPU UDH 630 (10th gen CPU), you can use this active DP->HDMI adapter:
Tested on my system, works great. Supports HDR!
After macOS installation add boot flag igfxonln=1 to your config.plist to fix a monitor not waking up after sleep (I mean display sleep, not system sleep).
FYI, you can use last BIOS version F20, it works well for me.
Plz try to set "CPU Base Clock" to 100.0 MHz or 100.01 MHz, not Auto, and test your Apollo Twin.
CPU Base Clock may affect audio USB devices, in "Auto" BIOS sometimes set it on 99.95 MHz or something like that...
Additional info about Z490 Vision G:
BIOS F20 works well (don't forget to disable "Resize BAR")
If you want to use iGPU for image output, you need boot flag igfxonln=1 to fix issue after display sleeps and wakes up - my display didn't wake up without this boot arg. I mean only display sleep...
Do you add information to both, Vision D and G manuals? I see it only in "Vision G adaptation" part, but @Higgie had USB-audio issues on Vision D, and he wrote after setting "CPU Base Clock" it works well.