extension uuid-ossp installation in database cluster

Hi I tried to configure extension uuid-ossp in database yml https://github.com/zalando/postgres-operator/blob/master/manifests/minimal-postgres-manifest.yaml but when the cluster was created I don't see the extension installed in postgres default database

Is something missing below here or below one is the right way to configure this extension.

apiVersion: "acid.zalan.do/v1"
kind: postgresql
metadata:
  name: acid-minimal-cluster
  namespace: default
spec:
  teamId: "acid"
  volume:
    size: 1Gi
  numberOfInstances: 2
  users:
    zalando:  # database owner
    - superuser
    - createdb
    foo_user: []  # role for application foo
  databases:
    foo: zalando  # dbname: owner
  preparedDatabases:
    bar:
      defaultUsers: true
      extensions:
        uuid-ossp: public
  postgresql:
    version: "12"

/shiv

Start with manifests/minimal-postgres-manifest.yaml and the preparedDatabases configuration shown in the report. Check how the operator handles uuid-ossp for the prepared database bar versus PostgreSQL's default database, then reproduce cluster creation with PostgreSQL 12. Done means the extension appears in the expected database or the configuration limitation is clearly documented.