@dejavju FYI Converted the qcow disk to vhd again and tried and this time it booted, so something perhaps went wrong in the conversion. All is good now.

@alpenliebeanj did you find a solution? Having the same issue after moving from KVM and following the migration guide https://xcp-ng.org/docs/migratetoxcpng.html#from-kvm-libvirt.

Tried changing to UEFI aswell but no luck

Bios:

UEFI: