Drainer pod is not started when broker is scaled down using AMQ operator

{"level":"info","ts":1571390223.4943252,"logger":"controller_activemqartemisscaledown","msg":"Found orphaned PVC(s) for ordinal 5. Creating drain pod amqp-broker-ss-5"}
{"level":"info","ts":1571390223.4943724,"logger":"controller_activemqartemisscaledown","msg":"Ordinal zero pod amqp-broker-ss podCondition Ready True, proceeding to create drainer pod."}
{"level":"error","ts":1571390223.502789,"logger":"controller_activemqartemisscaledown","msg":"Error while creating drain Pod amqp-broker-ss-5: ","error":"pods \"amqp-broker-ss-5\" is forbidden: error looking up service account kronos-dev/activemq-artemis-operator: serviceaccount \"activemq-artemis-operator\" not found","stacktrace":"github.com/rh-messaging/activemq-artemis-operator/vendor/github.com/go-logr/zapr.(*zapLogger).Error\n\t/tmp/go/src/github.com/rh-messaging/activemq-artemis-operator/vendor/github.com/go-logr/zapr/zapr.go:128\ngithub.com/rh-messaging/activemq-artemis-operator/pkg/draincontroller.(*Controller).processStatefulSet\n\t/tmp/go/src/github.com/rh-messaging/activemq-artemis-operator/pkg/draincontroller/controller.go:418\ngithub.com/rh-messaging/activemq-artemis-operator/pkg/draincontroller.(*Controller).syncHandler\n\t/tmp/go/src/github.com/rh-messaging/activemq-artemis-operator/pkg/draincontroller/controller.go:287\ngithub.com/rh-messaging/activemq-artemis-operator/pkg/draincontroller.(*Controller).processNextWorkItem.func1\n\t/tmp/go/src/github.com/rh-messaging/activemq-artemis-operator/pkg/draincontroller/controller.go:239\ngithub.com/rh-messaging/activemq-artemis-operator/pkg/draincontroller.(*Controller).processNextWorkItem\n\t/tmp/go/src/github.com/rh-messaging/activemq-artemis-operator/pkg/draincontroller/controller.go:247\ngithub.com/rh-messaging/activemq-artemis-operator/pkg/draincontroller.(*Controller).runWorker\n\t/tmp/go/src/github.com/rh-messaging/activemq-artemis-operator/pkg/draincontroller/controller.go:199\ngithub.com/rh-messaging/activemq-artemis-operator/pkg/draincontroller.(*Controller).runWorker-fm\n\t/tmp/go/src/github.com/rh-messaging/activemq-artemis-operator/pkg/draincontroller/controller.go:185\ngithub.com/rh-messaging/activemq-artemis-operator/vendor/k8s.io/apimachinery/pkg/util/wait.JitterUntil.func1\n\t/tmp/go/src/github.com/rh-messaging/activemq-artemis-operator/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:133\ngithub.com/rh-messaging/activemq-artemis-operator/vendor/k8s.io/apimachinery/pkg/util/wait.JitterUntil\n\t/tmp/go/src/github.com/rh-messaging/activemq-artemis-operator/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:134\ngithub.com/rh-messaging/activemq-artemis-operator/vendor/k8s.io/apimachinery/pkg/util/wait.Until\n\t/tmp/go/src/github.com/rh-messaging/activemq-artemis-operator/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:88"}
E1018 09:17:03.502887       1 controller.go:250] error syncing 'kronos-dev/amqp-broker-ss: pods "amqp-broker-ss-5" is forbidden: error looking up service account kronos-dev/activemq-artemis-operator: serviceaccount "activemq-artemis-operator" not found

$ oc describe deployment amq-broker-operator
Name:                   amq-broker-operator
Namespace:              amq-broker-dev
CreationTimestamp:      Fri, 18 Oct 2019 15:30:42 +0200
Labels:                 <none>
Annotations:            deployment.kubernetes.io/revision=1
Selector:               name=amq-broker-operator
Replicas:               1 desired | 1 updated | 1 total | 1 available | 0 unavailable
StrategyType:           RollingUpdate
MinReadySeconds:        0
RollingUpdateStrategy:  25% max unavailable, 25% max surge
Pod Template:
  Labels:           name=amq-broker-operator
  Service Account:  amq-broker-operator
  Containers:
   amq-broker-operator:
    Image:      registry.redhat.io/amq7/amq-broker-rhel7-operator:0.9
    Port:       <none>
    Host Port:  <none>
    Command:
      /home/amq-broker-operator/bin/entrypoint
    Args:
      --zap-level debug
    Environment:
      WATCH_NAMESPACE:   (v1:metadata.namespace)
      POD_NAME:          (v1:metadata.name)
      OPERATOR_NAME:    amq-broker-operator
    Mounts:             <none>
  Volumes:              <none>
Conditions:
  Type           Status  Reason
  ----           ------  ------
  Available      True    MinimumReplicasAvailable
  Progressing    True    NewReplicaSetAvailable
OldReplicaSets:  <none>
NewReplicaSet:   amq-broker-operator-5c455b9b4d (1/1 replicas created)
Events:          <none>