ECK operator unable to apply azure client proxy parameters "azure.client.default.proxy.*" to Elasticsearch

Elastic Orchestration Elastic Cloud on Kubernetes (ECK)
1

Deployed v3.1.0 ECK operator in OpenShift cluster.
Provisioned a Elasticsearch cluster.
Tried to configure Azure-repository plugin client proxy setting just like in the documentation:
Azure repository | Elasticsearch Guide [8.8] | Elastic

This is my ealsticsearch.yaml:

apiVersion: elasticsearch.k8s.elastic.co/v1
kind: Elasticsearch
metadata:
  name: elasticsearch
  namespace: efk
spec:
  secureSettings:
  - secretName: az-secret
  version: 8.8.2
  http:
    tls:
      selfSignedCertificate:
        subjectAltNames:
          - dns: elasticsearch-int
          - dns: elasticsearch-int-es-default-0
          - dns: elasticsearch-int.efk-int.svc
          - dns: elasticsearch-int.efk-int.svc.cluster.local
          - dns: elasticsearch-int-es-default-0.efk.svc.cluster.local
          - dns: elasticsearch-int.my-domain.com
          - dns: elasticsearch-int.apps.cluster-name.my-domain.com
  nodeSets:
    - name: default
      count: 1
      config:
        xpack.security.ssl.diagnose.trust: true
        xpack.security.http.ssl.supported_protocols: ["TLSv1.2"]
        azure.client.default.proxy.host: my-proxy.domain.com
        azure.client.default.proxy.port: 1234
        azure.client.default.proxy.type: http
      podTemplate:
        spec:
          securityContext:
            fsGroup: 1000
          serviceAccountName: elastic-sa
          containers:
            - name: elasticsearch-container
              resources:
                requests:
                  memory: 6Gi
                  cpu: 500m
                limits:
                  memory: 6Gi
                  cpu: 500m
              env:
                - name: ES_JAVA_OPTS
                  value: -Xms5g -Xmx5g
          imagePullSecrets:
            - name: my-secrets
      volumeClaimTemplates:
        - metadata:
            name: elasticsearch-data
          spec:
            accessModes:
            - ReadWriteOnce
            resources:
              requests:
                storage: 100Gi
            storageClassName: my-storage-class

But ReconciliationComplete Condition throws this error:

{"error":"elasticsearch client failed for https://elasticsearch-es-default-0.elasticsearch-es-default.efk:9200/_internal/desired_nodes/a85006df-6b4e-4de1-b556-4fa8974d1515/3: 400 Bad Request: {Status:400 Error:{CausedBy:{Reason: Type:} Reason:Nodes with ids [elasticsearch-es-default-0] in positions [0] contain invalid settings Type:illegal_argument_exception StackTrace: RootCause:[{Reason:Nodes with ids [elasticsearch-es-default-0] in positions [0] contain invalid settings Type:illegal_argument_exception}]}}"}

And CRD elasticsearch gets tuck in ApplyingChanges status.

This is after adding these parameters to the config:

        azure.client.default.proxy.host: my-proxy.domain.com
        azure.client.default.proxy.port: 1234
        azure.client.default.proxy.type: http

Can't deploy any changes without these settings and without these settings my Azure blob storage repository doesn't work anymore.

Would greatly appreciate for any opinions, ideas how to overcome this!