Operator resource is not cleaned up when any operator is installed via "A specific namespace on the cluster" in multiple namespaces

Issue

• Operator resource is not cleaned up automatically after removal of the operator (from one namespace) which was installed via "A specific namespace on the cluster" in multiple namespaces.

$ oc get operators | grep grafana
grafana-operator.test1   26m
grafana-operator.test2   25m
$ oc delete operator grafana-operator.test1
operator.operators.coreos.com "grafana-operator.test1" deleted
$ oc get operator grafana-operator.test-1
NAME                       AGE
grafana-operator.test1   8s

• How to delete operator resource created for a specific namespace after its uninstallation ?