Default user for schema have no access to preparedDatabase

Please, answer some short questions which should help us to understand your problem / question better?

• Which image of the operator are you using? registry.opensource.zalan.do/acid/postgres-operator:v1.8.2
• Where do you run it - cloud or metal? Kubernetes or OpenShift? DigitalOcean K8S
• Are you running Postgres Operator in production? yes
• Type of issue? Bug report

Prepared database defined like this:

spec:
  preparedDatabases:
    test:
      defaultUsers: true
      schemas:
        public:
          defaultRoles: true
          defaultUsers: true

test_reader_user have access to database, but test_public_reader_user do not have.

# psql -U test_owner_user test
test=> create table test (id int);
CREATE TABLE
test=> insert into test values (1);
INSERT 0 1
test=> insert into test values (2);
INSERT 0 1
test=> select * from test ;
 id 
----
  1
  2
(2 rows)

test=> \q

# psql -U test_reader_user test
test=> select * from test ;
 id 
----
  1
  2
(2 rows)

test=> \q

# psql -U test_public_reader_user test
test=> select * from test ;
ERROR:  permission denied for table test

The report names no source files or tests. Start by reproducing the supplied preparedDatabases configuration and psql permission checks, then trace how default schema roles are created; done means test_public_reader_user can read tables created by test_owner_user.