[Question] Is using PreviousTailAffinity in a single node cluster valid syntax?

Hey there. I tried to apply to following CR with podDistribution type set to PreviousTailAffinity and the reconciliation failed. I'm wondering if this is a semantic issue or a bug in operator. In case you want to see more details, I also attach the log of operator below.
Thanks.

apiVersion: clickhouse.altinity.com/v1
kind: ClickHouseInstallation
metadata:
  name: test-cluster
spec:
  configuration:
    clusters:
    - layout:
        replicasCount: 2
        shardsCount: 2
      name: replicated
    zookeeper:
      nodes:
      - host: zookeeper.zoo3.ns
  defaults:
    templates:
      dataVolumeClaimTemplate: default
      podTemplate: clickhouse:19.6
  templates:
    podTemplates:
    - name: clickhouse:19.6
      podDistribution:
      - type: PreviousTailAffinity
      spec:
        containers:
        - image: clickhouse/clickhouse-server:22.3
          name: clickhouse-pod
    volumeClaimTemplates:
    - name: default
      spec:
        accessModes:
        - ReadWriteOnce
        resources:
          requests:
            storage: 500Mi

affinity.log

Start with the supplied ClickHouseInstallation manifest and the attached affinity.log, then locate the operator's handling of PreviousTailAffinity and its validation rules. Reproduce the reconciliation failure with this manifest and determine whether the setting is valid for the shown cluster layout; done means the behavior is confirmed and documented or a clearly scoped operator bug is identified.