TypeError: unhashable type: 'dict'

[tnozicka]

I've tried to use the sphinxcontrib.openapi on an openapi v2 received from kubernetes apiserver (kubectl get --raw /openapi/v2 | yq -Poy) apiserver but it failed with

Sphinx parallel build error:
TypeError: unhashable type: 'dict'

unfortunately, there is no context in the error message to help assess which part of the file breaks it.

The corresponding rst file looks like

API Reference
=============

.. openapi:: kube.yaml

and the kube.yaml is attached within kube.zip