After run egressIP automation cases, found many IPs left for nutanix nic, then manually reproduced that egressIP was not removed from nutanix nic after deleting egressIP objects 

4.14.0-0.nightly-2023-05-19-234822 

Always

1. Label one node as egress node
% oc label node  huirwang-0522a-qx4w4-master-2    k8s.ovn.org/egress-assignable=    
node/huirwang-0522a-qx4w4-master-2 labeled

10. Create egressIP object  and create namespace
% oc get egressip
NAME         EGRESSIPS     ASSIGNED NODE                   ASSIGNED EGRESSIPS
egressip-1   10.0.132.80   huirwang-0522a-qx4w4-master-2   10.0.132.80

 % oc create ns test
namespace/test created

% oc create -f ../data/4.12/ping-pod.yaml -n test
pod/hello-pod created
Before add label to namespace test, check the node huirwang-0522a-qx4w4-master-2, egressIP was not there.
[
  {
    "nic_type": "NORMAL_NIC",
    "uuid": "395748c3-d5fe-4c3b-8da4-a482c40fc12b",
    "ip_endpoint_list": [
      {
        "ip": "10.0.132.235",
        "type": "ASSIGNED"
      }
    ],
    "vlan_mode": "ACCESS",
    "mac_address": "50:6b:8d:ec:fd:69",
    "subnet_reference": {
      "kind": "subnet",
      "name": "uvm_network2",
      "uuid": "efe26e93-f6cf-4d89-8104-009e85201fa8"
    },
    "is_connected": true,
    "trunked_vlan_list": []
  }
]

Add label to namespace test
 % oc label ns test name=qe
namespace/test labeled

 Check node huirwang-0522a-qx4w4-master-2
[
  {
    "nic_type": "NORMAL_NIC",
    "uuid": "395748c3-d5fe-4c3b-8da4-a482c40fc12b",
    "ip_endpoint_list": [
      {
        "ip": "10.0.132.235",
        "type": "ASSIGNED"
      },
      {
        "ip": "10.0.132.80",
        "type": "LEARNED"
      }
    ],
    "vlan_mode": "ACCESS",
    "mac_address": "50:6b:8d:ec:fd:69",
    "subnet_reference": {
      "kind": "subnet",
      "name": "uvm_network2",
      "uuid": "efe26e93-f6cf-4d89-8104-009e85201fa8"
    },
    "is_connected": true,
    "trunked_vlan_list": []
  }
]

Delete egressIP object and namespace test
% oc get egressip
No resources found
 % oc get ns test
Error from server (NotFound): namespaces "test" not found

Checked node huirwang-0522a-qx4w4-master-2 nic again

EgressIP was not removed
[
  {
    "nic_type": "NORMAL_NIC",
    "uuid": "395748c3-d5fe-4c3b-8da4-a482c40fc12b",
    "ip_endpoint_list": [
      {
        "ip": "10.0.132.235",
        "type": "ASSIGNED"
      },
      {
        "ip": "10.0.132.80",
        "type": "LEARNED"
      }
    ],
    "vlan_mode": "ACCESS",
    "mac_address": "50:6b:8d:ec:fd:69",
    "subnet_reference": {
      "kind": "subnet",
      "name": "uvm_network2",
      "uuid": "efe26e93-f6cf-4d89-8104-009e85201fa8"
    },
    "is_connected": true,
    "trunked_vlan_list": []
  }
]

EgressIP should be removed from VM  NIC.