I have disabled the secrets section in cr.yaml completely to see what operator will generate by default, this is what I got:

As you can see the users secret doesn't include the cluster name, but operator name which is not optimal.

It is set here: https://github.com/percona/percona-server-mongodb-operator/blob/main/pkg/apis/psmdb/v1/psmdb_defaults.go#L27

Also internal secrets have inconsistent naming, check this:

one is called "internal-my-cluster-name-users" and the other one is "my-cluster-name-ssl-internal" so one uses internal as prefix and the other one as suffix.