Creating an OperatorGroup resource having "name: cluster" causes major issues and we can't login to the cluster anymore.

After this command all "oc" commands fail including "oc login...". The console/oauth endpoint showed:
{"error":"server_error","error_description":"The authorization server encountered an unexpected condition that prevented it from fulfilling the request.","state":"c72af27d"}

Notes:
- Restarting the cluster doesn't solve the problem, it's a persistent.
- Reproduced with OpenShift 4.12.12 and 4.13.0 in different environments (ROSA, CRC...)
- Using a different name for the OperatorGroup is a simple workaround. The name "cluster" seems to cause the problem.
- It doesn't matter what namespace the OperatorGroup is created in or how the "spec" looks like 

Repeatedly

Steps to reproduce - by logged in as cluster-admin: 
$ oc apply -f - <<EOF
apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: cluster
spec: {}
EOF

The root cause seems to be that OLM overwrites the "cluster-admin" role