GKE Ingress failure - NetworkEndpointGroup not getting generated

[tamuram]

Ingress, which was working until last week, suddenly started giving the following error. I haven't made any modifications, and even if I recreate the ingress and service, the error still occurs. Is there any solution?

Error syncing to GCP: error running backend syncing routine: googleapi: Error 404: The resource 'projects/project-name/zones/asia-east1-b/networkEndpointGroups/k8s1-b11894c0-kube-system-default-http-backend-80-a50a8f0e' was not found, notFoun

# inngress.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: stg-cdn-entrypoint-ingress
  namespace: cdn
  annotations:
    kubernetes.io/ingress.class: "gce"
    kubernetes.io/ingress.global-static-ip-name: app-cdn-static-ip
    networking.gke.io/managed-certificates: cdn-cert
spec:
  rules:
    - http:
        paths:
          - backend:
              service:
                name: stg-cdn-frontend-svc
                port:
                  number: 8080
            path: /*
            pathType: ImplementationSpecific

# sercice.yaml
apiVersion: v1
kind: Service
metadata:
  name: stg-cdn-frontend-svc
  namespace: cdn
  labels:
    app: cdn-frontend-svc
    tier: frontend
  annotations:
    cloud.google.com/neg: '{"ingress": true}'
spec:
  type: NodePort
  selector:
    app.kubernetes.io/name: cdn-server
  ports:
    - name: http
      protocol: TCP
      port: 8080
      targetPort: 8080