Installing a 4.14 self-managed hosted cluster on a dual-stack hub with the "hypershift create cluster agent" command. The logs of the hypershift operator pod show a bunch of these errors:

{"level":"error","ts":"2023-06-08T13:36:26Z","msg":"Reconciler error","controller":"hostedcluster","controllerGroup":"hypershift.openshift.io","controllerKind":"HostedCluster","hostedCluster":{"name":"hosted-0","namespace":"clusters"},"namespace":"clusters","name":"hosted-0","reconcileID":"a0a0f44f-7bbe-499f-95b0-e24b793ee48c","error":"failed to reconcile network policies: failed to reconcile kube-apiserver network policy: NetworkPolicy.extensions \"kas\" is invalid: spec.egress[1].to[0].ipBlock.except[1]: Invalid value: \"fd01::/48\": must be a strict subset of `cidr`","stacktrace":"sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem\n\t/remote-source/app/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:273\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2\n\t/remote-source/app/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:234"}


The hostedcluster CR is showing the same ReconciliationError. Note that the networking section in the hostedcluster CRD created by the "hypershift create cluster agent" command has ipv4 CIDR:

  networking:
    clusterNetwork:
    - cidr: 10.132.0.0/14
    networkType: OVNKubernetes
    serviceNetwork:
    - cidr: 172.31.0.0/16


while services have ipv6 nodeport addresses.

$ oc version
Client Version: 4.14.0-0.nightly-2023-06-05-112833
Kustomize Version: v4.5.7
Server Version: 4.14.0-0.nightly-2023-06-05-112833
Kubernetes Version: v1.27.2+cc041e8

100%

1. Install 4.14 OCP dual-stuck BM hub cluster
2. Install MCE 2.4 and Hypershift operator
3. Install hosted cluster with "hypershift create cluster agent" command 

hosted cluster CR shows ReconciliationError:

  - lastTransitionTime: "2023-06-08T10:55:33Z"
    message: 'failed to reconcile network policies: failed to reconcile kube-apiserver
      network policy: NetworkPolicy.extensions "kas" is invalid: spec.egress[1].to[0].ipBlock.except[1]:
      Invalid value: "fd01::/48": must be a strict subset of `cidr`'
    observedGeneration: 2
    reason: ReconciliationError
    status: "False"
    type: ReconciliationSucceeded

ReconciliationSucceeded condition should be True

Logs and CRDs produced by the failed job: https://s3.upshift.redhat.com/DH-PROD-OCP-EDGE-QE-CI/ocp-spoke-assisted-operator-deploy/8044/post-mortem.zip