In the section here [1] there is an incorrect yaml format on where to configure the reachabilityTotalTimeoutSeconds feature of OVN egressIPs. The example should be something like this:

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  annotations:
    networkoperator.openshift.io/ovn-cluster-initiator: 10.0.171.79
  creationTimestamp: "2023-09-13T09:43:13Z"
  generation: 72
  name: cluster
  resourceVersion: "55453"
  uid: f7137f5e-6474-4339-8cfe-1652fd3a84d0
spec:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23
  defaultNetwork:
    ovnKubernetesConfig:
      egressIPConfig:
        reachabilityTotalTimeoutSeconds: 3
      gatewayConfig:
        routingViaHost: false
      genevePort: 6081
      mtu: 8901
      policyAuditConfig:
        destination: "null"
        maxFileSize: 50
        rateLimit: 20
        syslogFacility: local0
    type: OVNKubernetes

[1] https://docs.openshift.com/container-platform/4.13/networking/ovn_kubernetes_network_provider/configuring-egress-ips-ovn.html#nw-egress-ips-config-object_configuring-egress-ips-ovn

OCP documentation 4.12 and 4.13

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