This is covered in the official GitHub issue: https://github.com/bitnami/charts/issues/35164

Q: What will happen to the existing OCI Helm charts? A: The already packaged Helm charts will remain available at docker.io/bitnamicharts as OCI artifacts, but they will no longer receive updates. Deploying these charts will not work out-of-the-box unless you override the bundled images with valid ones. *except for the BSI images included in the free community-tier subset.