Python middleware error when trying example from documentation

@Pete thank you for the help.
I tried to switch to bundle but to no avail
Based on the manual - create and uploaded sample and updated API config. Tyk downloads it to somewhere but then fails to find it on the file system

Could you, please, help me to nail the issue?

Error:
time="Jun 29 08:44:48" level=info msg="----> Fetching Bundle: bundle" prefix=main time="Jun 29 08:44:48" level=debug msg="----> Saving Bundle: bundle" prefix=main time="Jun 29 08:44:48" level=info msg="----> Loading bundle: bundle" prefix=main time="Jun 29 08:44:48" level=error msg="Couldn't load bundle: open /mnt/tyk-gateway/middleware/bundles/1_94377c156735b39dfa4ac607234cb87c/manifest.json: no such file or directory" api_id=1 org_id=LW path=- prefix=main server_name="http://mlt-mt-api.mlt-modernmt.svc.cluster.local/" user_id=- user_ip=-

Tyk gateway config:

"coprocess_options": {
    "enable_coprocess": true,
    "python_path_prefix": "/opt/tyk-gateway"
},
"enable_bundle_downloader": true,
"bundle_base_url": "https://storage.cloud.google.com/mlt-sandbox/tyk-plugins/",

API gateway config:

  "custom_middleware": {
    "pre": null,
    "post": null,
    "post_key_auth": null,
    "auth_check": {
      "name": "",
      "path": "",
      "require_session": false,
      "raw_body_only": false
    },
    "response": null,
    "driver": "python",
    "id_extractor": {
      "extract_from": "",
      "extract_with": "",
      "extractor_config": null
    }
  },
  "custom_middleware_bundle": "bundle",

bundle content, based on shared above - can be downloaded via
https://storage.cloud.google.com/mlt-sandbox/tyk-plugins/bundle.zip