Description of problem:
While performing an ipv6 sno deployment.  The pod in the assisted-installer name space on the sno cluster is failing with image pull error.  When trying to manually pull the image i get a manifest unknown error.

the Image mirror of this container did not fail.

Version-Release number of selected component (if applicable):
from quay.io/ocpmetal/assisted-installer-controller:latest

How reproducible:
100%

Steps to Reproduce:
1. Deploy OCP hub disconnted ipv6 with disco registry
2. Start sno deployment
3. Sno will succeede but the hub cluster wont report or register a successful deployment.

Actual results:
From the SNO node:
[root@sno ~]# oc get pods -n assisted-installer
NAME                                  READY   STATUS             RESTARTS   AGE
assisted-installer-controller-mjdpl   0/1     ImagePullBackOff   0          73m
[root@sno ~]# oc get nodes
NAME   STATUS   ROLES           AGE   VERSION
sno    Ready    master,worker   60m   v1.21.0-rc.0+6825c59

# podman pull registry.ocp-edge-cluster-bjacot2-0.qe.lab.redhat.com:5000/assisted-installer-controller:latest
Trying to pull registry.ocp-edge-cluster-bjacot2-0.qe.lab.redhat.com:5000/assisted-installer-controller:latest...
  manifest unknown: manifest unknown

Expected results:
Expected the assisted-installer-controller pod to start

Additional info:
no workaround at this time.