What were you trying to do that didn't work?

Attach a pcie-to-pci-bridge controller to a s390-ccw-virtio machine.

Please provide the package NVR for which bug is seen:

libvirt-10.5.0-6.el9_5.s390x

How reproducible:

Steps to reproduce

Try have a VM with <controller type="pci" model="pcie-to-pci-bridge"/> (define, edit, attach)

Expected results

There's an error message "not supported for s390-ccw-virtio machine type"

Actual results

error: internal error: Cannot automatically add a new PCI bus for a device with connect flags 1000
Failed. Try again? [y,n,i,f,?]:

Additional info

This is not a regression we just started testing it recently.
It reproduces on RHEL 8.10 libvirt-8.0.0