Docker Scout fails to recognise DHI base image

Github Actions pipeline run for reference -> https://github.com/unixerius/proxmox-qdevice/actions/runs/21072965388/job/60607307451

The same issue occurs with Scout as integrated into Docker Hub -> https://hub.docker.com/repository/docker/unixerius/proxmox-qdevice/general

The containers that are being built are based off of Docker's DHI (docker hardened image) Debian Base image -> https://hub.docker.com/hardened-images/catalog/dhi/debian-base

The Docker Buildx instructions for my containers include the options for --sbom and --provenance mode=max. Both Buildx and Scout confirm that provenance information is included in the image.

Regardless, Docker Scout fails to recognise the base image.

Logs from the pipeline run:

Run docker/scout-action@v1
  with:
    command: quickview,cves
    image: ghcr.io/***/proxmox-qdevice:bookworm
    ignore-unchanged: true
    only-severities: critical,high
    github-token: ***
    summary: true
    format: json
    write-comment: true
  env:
    registry: ***
    image: proxmox-qdevice
quickview
      ✓ SBOM obtained from attestation, 135 packages found
      ✓ Provenance obtained from attestation
  Error: image has no base image

Start with the docker/scout-action@v1 invocation and its quickview,cves output, then inspect how Scout obtains and interprets the SBOM and provenance attestations for the linked DHI Debian base image. Done means Scout recognises the DHI base image instead of reporting "image has no base image" in the provided pipeline and Docker Hub cases.