`MutatingWebhookConfiguration` conflict when upgrading from 1.6 to 1.7 about admission-webhook-operator HOT 2 CLOSED

I0614 17:08:21.895892       1 main.go:660] 1 matching pod defaults, for pod testnb-0
I0614 17:08:21.895904       1 main.go:666] Matching PD detected of count 1, patching spec
I0614 17:08:21.895970       1 main.go:479] mutating pod: testnb-0
I0614 17:08:21.896013       1 main.go:681] applied poddefaults: access-ml-pipeline successfully on Pod: testnb-0 
I0614 17:08:21.904028       1 main.go:598] Entering mutatePods in mutating webhook
I0614 17:08:21.904575       1 main.go:624] Looking at pod annotations, found: map[kubectl.kubernetes.io/default-container:testnb kubectl.kubernetes.io/default-logs-container:testnb poddefault.admission.kubeflow.org/poddefault-access-ml-pipeline:34168 prometheus.io/path:/stats/prometheus prometheus.io/port:15020 prometheus.io/scrape:true sidecar.istio.io/status:{"initContainers":["istio-init"],"containers":["istio-proxy"],"volumes":["workload-socket","credential-socket","workload-certs","istio-envoy","istio-data","istio-podinfo","istio-token","istiod-ca-cert"],"imagePullSecrets":null,"revision":"default"}]
I0614 17:08:22.765280       1 main.go:644] fetched 1 poddefault(s) in namespace test
I0614 17:08:22.765324       1 main.go:660] 1 matching pod defaults, for pod testnb-0
I0614 17:08:22.765332       1 main.go:666] Matching PD detected of count 1, patching spec
E0614 17:08:22.765533       1 main.go:349] merging volumes for access-ml-pipeline has a conflict on volume-kf-pipeline-token: 

kubectl get mutatingwebhookconfigurations | grep admission-webhook
NAME                                                        WEBHOOKS   
kubeflow-admission-webhook                                  1          
kubeflow-admission-webhook-mutating-webhook-configuration   1