OSSM 2.1 error inserting data for namespace: error when creating configmap istio-ca-root-cert: configmaps "istio-ca-root-cert" already exists

When I tested the adding external cert configuration [1] using a sleep sample in foo ns,

[1] https://docs.openshift.com/container-platform/4.8/service_mesh/v2x/ossm-security.html#ossm-cert-manage_ossm-security

The existing configmaps "istio-ca-root-cert" doesn't get cleanup after I delete the sleep deployment.
The configmaps "istio-ca-root-cert" blocks all future SMCP custom root or ca cert configurations.

istiod error log

error inserting data for namespace: error when creating configmap istio-ca-root-cert: configmaps "istio-ca-root-cert" already exists

How to reproduce :
Try to test the adding external cert configuration [1] twice in a namespace "foo" and use a sample app sleep.
The second run will fail and istiod log shows errors above.

Expected behavior:
User should be able to configure custom or external certs using SMCP spec configurations. An existing configmaps "istio-ca-root-cert" should be updated in member namespace instead of blocking a new cert insertion.