Artifactory does not support adding both types of Helm repositories (Helm and Helm OCI) in the same virtual repository. You can have two virtual repositories, one for Helm and one for Helm OCI.
Xray does not support scanning Helm charts.
Index manifests are not automatically moved, copied, or deleted with their related images. When performing these actions, select both the index manifests and the related images.
Since OCI can support multiple formats, Helm OCI is not limited to storing just Helm charts: although it is described as Helm, is is compliant with OCI and allows you to upload any file type.