Description of problem:
Running following command:
oc adm catalog build --appregistry-org redhat-operators --from=registry.redhat.io/openshift4/ose-operator-registry:v4.3 --to=`hostname`:55555/olm/redhat-operators:v1  -a ${REG_CREDS} --insecure

fails with:
error: unable to parse image registry.redhat.io/openshift4/ose-operator-registry:v4.3: unknown image manifest of type *manifestlist.DeserializedManifestList from manifest sha256:56e8a4340ebb2d919c125b3c24b9b74bf843698f894d1da1c8dc5267dea52e67

It's working fine when using v4.4 instead of v4.3

Version-Release number of selected component (if applicable):
ose-operator-registry:v4.3

How reproducible:
Always

Steps to Reproduce:
1. Prepare mirror registry following https://docs.openshift.com/container-platform/4.4/installing/install_config/installing-restricted-networks-preparations.html
2. Following https://docs.openshift.com/container-platform/4.4/operators/olm-restricted-networks.html
run following command:
oc adm catalog build --appregistry-org redhat-operators --from=registry.redhat.io/openshift4/ose-operator-registry:v4.3 --to=`hostname`:55555/olm/redhat-operators:v1  -a ${REG_CREDS} --insecure



Actual results:
fails with:
error: unable to parse image registry.redhat.io/openshift4/ose-operator-registry:v4.3: unknown image manifest of type *manifestlist.DeserializedManifestList from manifest sha256:56e8a4340ebb2d919c125b3c24b9b74bf843698f894d1da1c8dc5267dea52e67

Expected results:
No errors

Additional info:
It works fine when using v4.4 instead of v.4.3:
oc adm catalog build --appregistry-org redhat-operators --from=registry.redhat.io/openshift4/ose-operator-registry:v4.4 --to=`hostname`:55555/olm/redhat-operators:v1  -a ${REG_CREDS} --insecure