bucketclass set in yaml file doesn't take effect while create obc using kubectl create

[lzw06061139]

Environment info

• NooBaa Operator Version: 5.17.1
• Platform: minikube 1.34.0

Actual behavior

1. create obc with yaml, bucketclass set in yaml file doesn't take effect. the result of "noobaa obc list" shows that the default bucket class "noobaa-default-bucket-class" is set.
   % sudo noobaa obc list
   NAMESPACE NAME BUCKET-NAME STORAGE-CLASS BUCKET-CLASS PHASE
   noobaa llm-multi-store-obc llm-multi-store noobaa.noobaa.io noobaa-default-bucket-class Bound

But, "kubectl describe -n noobaa objectbucketclaim llm-multi-store-obc" shows the bucketclass set success.
Name: llm-multi-store-obc
Namespace: noobaa
Labels: app=noobaa
bucket-provisioner=noobaa.noobaa.io-obc
noobaa-domain=noobaa.noobaa.io
Annotations:
API Version: objectbucket.io/v1alpha1
Kind: ObjectBucketClaim
Metadata:
Creation Timestamp: 2025-01-03T06:33:29Z
Finalizers:
objectbucket.io/finalizer
Generation: 2
Resource Version: 782679
UID: 4e512325-01be-4ca8-87e8-f1913a3c5757
Spec:
Additional Config:
Bucketclass: llm-multi-bucket-class
Bucket Name: llm-multi-store
Generate Bucket Name: llm-multi-store
Object Bucket Name: obc-noobaa-llm-multi-store-obc
Storage Class Name: noobaa.noobaa.io
Status:
Phase: Bound
Events:

Expected behavior

1. the bucketclass set in yaml files takes effect

Steps to reproduce

1. create two namespace stores
   % sudo noobaa namespacestore create s3-compatible llm-store2-ns --endpoint={endpoint} --target-bucket=llm-store2 --signature-version=v2
   % sudo noobaa namespacestore create s3-compatible llm-store-ns --endpoint={endpoint} --target-bucket=llm-store --signature-version=v2
2. create a "multi" type bucket class
   % sudo noobaa bucketclass create namespace-bucketclass multi llm-multi-bucket-class --write-resource=llm-store2-ns --read-resources=llm-store-ns
3. create obc with yaml

apiVersion: objectbucket.io/v1alpha1
kind: ObjectBucketClaim
metadata:
  name: llm-multi-store-obc
  namespace: noobaa
spec:
  additionalConfig:
    Bucketclass: llm-multi-bucket-class
  generateBucketName: llm-multi-store
  bucketName: llm-multi-store
  storageClassName: noobaa.noobaa.io

% sudo kubectl create -f obc.yaml

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