Boot error IO_PAGE_FAULT on ASUS motherboard with Thunderbolt 4

I've been running into the same issue, with the same motherboard. The only thing that worked for me so far was disabling Thunderbolt support in the UEFI, which is a setting that I've only managed to find through the search function (F9).

Once disabled, the boot time immediately improved tenfold. Unfortunately, it seems that this completely disables both Thunderbolt ports on the motherboard, and I've not been able to use them as regular USB-C ports either.

I hope that this helps, though it's obviously not an actual fix, but rather a workaround if you don't specifically need these ports.

If I somehow get them working with Thunderbolt support enabled, I'll be sure to provide an update here.