E.g., this:

jobs:
- name: my-job
  plan:
  - get: repo
  - task: my-task
    config:
      ...
      outputs:
        - name: foo
        - path: foobar

Gets parsed into:

      ...
      outputs:
        - name: foo
          path: ""
        - name: ""
          path: foobar

It's possible this has an impact elsewhere, but we got tripped up with our output naming. Via fly hijack, we additionally found this wiped out everything in concourse's execution root folder with the contents of our empty-named output.