Hello,
Same problem here. Temporary workaround from karnow98 works.
wget http://download.proxmox.com/debian/dists/bullseye/pve-no-subscription/binary-amd64/pve-qemu-kvm_6.0.0-4_amd64.deb
dpkg -i pve-qemu-kvm_6.0.0-4_amd64.deb
apt-mark hold pve-qemu-kvm
pveversion after downgrade.
proxmox-ve...