Kibana `status.version` field not updated on upgrade

[ailiev-ipq]

I have an ECK 3.1.0 running in a Kubernetes cluster and managing a single Elasticsearch/Kibana pair.

Initially Elasticsearch/Kibana were at version 8.13.2.

I updated the Elasticsearch/Kibana manifests, the only difference being the version bump from 8.13.2 to 8.19.3.

The Elasticsearch (three node cluster) was correctly upgraded to 8.19.3 and its version was correctly reported (e.g., in kubectl get elasticsearch).

During the Elasticsearch upgrade the Kibana resource got the following event in kubectl describe kibana:

Events:
  Type     Reason     Age                From               Message
  ----     ------     ----               ----               -------
  Warning  Delayed    13m (x2 over 13m)  kibana-controller  Delaying deployment of version 8.19.3 since the referenced elasticsearch is not upgraded yet

(which makes perfect sense.)

It looks like the Kibana was also upgraded after the Elasticsearch upgrade was complete, because:

• I see in the Kibana UI that the version is 8.19.3 (and the UI differs from the 8.13.2 one)
• the .spec.containers[0].image reports docker.elastic.co/kibana/kibana:8.19.3
  but kubectl get kibana still reports 8.13.2.

It seems that the upgrade had happened immediately after the Elasticsearch upgrade had finished (Elasticsearch phase Ready, health green), but this isn't reflected in the status.version field of the Kibana resource.