CNV 4.19.15 + MTC 1.8.12
CNV 4.20.3  + MTC 1.8.12

Always

1. Create a PVC via the console manually (not a DataVolume for a VM)

2. Create VM with a single disk, setup like this, referring to that PVC

spec:
  template:
    spec:
      volumes:
        - name: disk-yellow-chipmunk-18
          persistentVolumeClaim:
            claimName: disk-1

2. PVC/disk-1 is Filesystem

3. Use Storage Live Migration to move it to Block

Fails in MTC before the VM migration is triggered

{"level":"info","ts":1771723691.2272615,"logger":"directvolume","msg":"Phase execution failed.","phase":"CreateRsyncTransferPods","phaseDescription":"Creating Rsync daemon pods on the target cluster","error":"source and destination must be the same type of volume"}

func isBlockOrVMDisk(pvc *v1.PersistentVolumeClaim) bool {
	if pvc == nil {
		return false
	}
	isBlock := pvc.Spec.VolumeMode != nil && *pvc.Spec.VolumeMode == v1.PersistentVolumeBlock
	if !isBlock {
		if v, ok := pvc.GetAnnotations()[kubeVirtAnnKey]; !ok || v != kubevirtContentType {  <---- manual PVC disks don't have this annotation
			return false
		}
		isBlock = true
	}
	return isBlock
}