Output of helm version: 3.13.1

Output of kubectl version: v1.25.2

Hi, based on the changelog and on some issues (e.g. #11440), it should be possible, to remove a value from a subchart by using value: null. Unfortunately, this does not work in my case.

Here are some some easy steps to reproduce my issue:
1 helm create umbrella-chart
2. remove all templates and the clear values.yaml
3. add the prometheus dependency to the Chart.yaml

dependencies:
- name: prometheus
  version: 25.2.0
  repository: https://prometheus-community.github.io/helm-charts

4. helm dep update
5. Add this to values.yaml

prometheus:
  server:
    securityContext: null

6. Run helm template foo -s charts/prometheus/templates/deploy.yaml . -f values.yaml

Expected Result
The block

      securityContext:
        fsGroup: 65534
        runAsGroup: 65534
        runAsNonRoot: true
        runAsUser: 65534

should not be in the deploy.yaml

Actual Result
The block securityContext with it's subkeys is in the deploy.yaml. No way to remove it.