Uploading Helm Chart via HTTP PUT does not generate "digest" key in index.yaml

When uploading a helm chart to a hosted repository via HTTP PUT, the given chart entry in the index.yaml does not generate/contain the "digest" key which is expected as shown in https://helm.sh/docs/topics/chart_repository/#the-index-file

To reproduce, upload a helm chart to a hosted helm repository via a PUT e.g.

curl -u <username>:<password> http://<host>:<port>/repository/<repository_name>/ --upload-file mysql-1.4.0.tgz -v

Then view the repository's updated index.yaml.

Expected

Other upload methods such as via the UI or REST API do not result in this issue, so it is expected that a PUT upload should also behave in the same way and ensure the digest is generated and included in the index.yaml