Loki Helm Chart Configuration Issues (use_thanos_objstore)

[TreeKat71]

Describe the bug
I also post it in grafana community here

In short, enable use_thanos_objstore and config storage.object_store should work fine. But it doesn't.
And without storage.bucketNames.chunks, I can't even do helm install

To Reproduce
Steps to reproduce the behavior:
Helm chart version: 6.27.0
Install values.yaml like:

deploymentMode: SimpleScalable

loki:
  storage:
    use_thanos_objstore: true

    bucketNames:
      chunks: dummy-value     <--- I have to use this to prevent an error

    object_store:
      type: s3
      prefix: null            <---- this seems buggy and need to be removed

Expected behavior
All S3 config should now be placed under object_store and should work fine.
But the object_store.prefix seems buddy and break Config

Environment:

• Infrastructure: Kubernetes
• Deployment tool: helm

Screenshots, Promtail config, or terminal output