diff looks good (between v4 and v3)

diff -y <(gh pr diff 30697) <(gh pr diff 30768)

Manual test with steps from #30622 also works as well. Exact commands if anyone wants to follow along:

1. create CRD

   kubectl apply -f - <<EOF
   apiVersion: apiextensions.k8s.io/v1
   kind: CustomResourceDefinition
   metadata:
     name: datas.crd.com
   spec:
     group: crd.com
     scope: Namespaced
     names:
       plural: datas
       singular: data
       kind: Data
     versions:
     - name: v1
       served: true
       storage: true
       schema:
         openAPIV3Schema:
           type: object
           x-kubernetes-preserve-unknown-fields: true
   EOF

2. apply a CR (removed ns from original example)

   kubectl apply -f - <<EOF
   kind: Data
   apiVersion: crd.com/v1
   metadata:
     name: crd-test
     labels:
       test: adopt
   spec:
     color: blue
     size: large
   EOF

3. build helm binary from this PR

   binary will be in ./bin/helm

   gh pr checkout 30768
   make clean build

4. create and install chart containing a different version of that same CR

   name=pr-30768
   mkdir -p $name/templates
   
   cat > $name/Chart.yaml <<EOF
   apiVersion: v2
   name: $name
   version: 0.1.0
   EOF
   
   cat > $name/templates/test.yaml <<EOF
   kind: Data
   apiVersion: crd.com/v1
   metadata:
     name: crd-test
     labels:
       test: adopt
   spec:
     weight: heavy
   EOF
   
   ./bin/helm install pr-30768 pr-30768/ --take-ownership

5. ensure generation has incremented and spec values have been merged

   kubectl get datas.crd.com crd-test -oyaml

   you should see

   metadata:
     generation: 2

   and

   spec:
     color: blue
     size: large
     weight: heavy

LGTM. Confirmed same results with the instructions/steps provided by @scottrigby