I am having exactly the same issue with qemu-6.1.
While trying to solve this i stumbled upon issue 774 on the qemus gitlab page.
I also found a german post on the proxmox forum with the same issue.
Here it is reported that this might be a issue with the german windows iso and that it works with the english one.
I will try this later and report back.
What language version of windows have you been using?
PS: Since i just registered i can’t post these links here yet.
UPDATE:
I can confirm that it works with an english iso, virtio network drivers install fine now.