Action stuck after successful upload

[simonknittel]

I'm having the issue that after the upload finished, the action gets stuck and doesn't stop. It will run forever until it gets canceled by an action wide timeout.

My workflow file:

name: sbom-grafana

on:
  push:
    branches:
      - main
    paths:
      - .github/workflows/sbom-grafana.yml

jobs:
  generate_and_upload:
    runs-on: ubuntu-22.04
    timeout-minutes: 3
    steps:
      - uses: anchore/[email protected]
        with:
          image: grafana/grafana-oss:10.4.1
          artifact-name: sbom.cdx.json
          output-file: sbom.cdx.json
          format: cyclonedx-json

      - uses: DependencyTrack/[email protected]
        with:
          serverhostname: my-hostname
          apikey: ${{ secrets.DTRACK_APIKEY }}
          project: my-project-id
          bomfilename: sbom.cdx.json

      - uses: actions/[email protected]
        with:
          name: sbom.cdx.json
          path: sbom.cdx.json

The logs look like this:

Run DependencyTrack/gh-upload-sbom@master
Reading BOM: sbom.cdx.json...
Uploading to Dependency-Track server my-hostname...
Response status code:
Finished uploading BOM to Dependency-Track server.
Error: The operation was canceled.

Notably, the Response status code: is empty. Also, I can confirm that the upload finished successfully since Dependency Track shows me the correct date for Last BOM Import.

Any idea what is happening?