Description of problem:
-----------------------
On dualstack baremetal IPI cluster next error message is present in ovnkube logs:

oc logs -n openshift-ovn-kubernetes ovnkube-node-rvggh -c ovnkube-node
...

E0810 02:12:46.343460 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
E0810 02:13:16.347603 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
E0810 02:13:46.351108 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
E0810 02:14:16.355047 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
E0810 02:14:46.358950 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
I0810 02:15:13.313945 353971 reflector.go:535] k8s.io/client-go/informers/factory.go:134: Watch close - *v1.Service total 9 items received
E0810 02:15:16.362737 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
E0810 02:15:46.366490 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
E0810 02:16:16.369963 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
I0810 02:16:24.306561 353971 reflector.go:535] k8s.io/client-go/informers/factory.go:134: Watch close - *v1.Endpoints total 560 items received
E0810 02:16:46.373482 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
E0810 02:17:16.377497 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
E0810 02:17:46.380726 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
I0810 02:18:15.325871 353971 reflector.go:535] k8s.io/client-go/informers/factory.go:134: Watch close - *v1.Node total 50 items received
E0810 02:18:16.384732 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
I0810 02:18:38.299738 353971 reflector.go:535] k8s.io/client-go/informers/factory.go:134: Watch close - *v1.Pod total 9 items received
E0810 02:18:46.388162 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1
E0810 02:19:16.391669 353971 node_linux.go:593] Failed to dump flows for flow sync, stderr: "ovs-ofctl: br-ext is not a bridge or a socket\n", error: exit status 1

Version-Release number of selected component (if applicable):
-------------------------------------------------------------
OCP-4.10.26

ovn-2021-21.12.0-58.el8fdp.x86_64
ovn-2021-host-21.12.0-58.el8fdp.x86_64
ovn-2021-central-21.12.0-58.el8fdp.x86_64
ovn-2021-vtep-21.12.0-58.el8fdp.x86_64

How reproducible:
-----------------
so far spotted on 2 different clusters

Steps to Reproduce:
-------------------
1. Deploy dualstack baremetal IPI cluster with OVNKubernetesHybrid network(add next to cluster's config before running cluster install):

defaultNetwork:
type: OVNKubernetes
ovnKubernetesConfig:
hybridOverlayConfig:
hybridClusterNetwork: []

Actual results:
---------------
Error message in logs

Expected results:
-----------------
No error message in logs

Additional info:
----------------
Baremetal dualstack setup with 3 masters and 4 workers, bonding configured for baremetal network on masters and workers