ASRock x570 Phantom TB3-ITX and Linux - "No bus number available for hot-added bridge"

I was actually just looking into getting 10g networking on Ryzen ITX and this seemed to be the only option I could find as well. I wish I had a better solution here, but maybe just tune your fan profiles in EFI/BIOS to be less aggressive? I’m debating on going with an APU to avoid this problem, though I know that’s not ideal, and probably impossible in your case.