The validate-markdown check is currently failing on all branches but main because main now has a very different JavaScript configuration from the branches. Those branches should have GitHub actions that match their environments, but currently on v3.1.1-dev and v3.2.0-dev, the JavaScript package that validate-markdown runs fails even if you just ask it for help output:
(.venv) handrews@ixat OpenAPI-Specification % npx mdv versions/3.*.md
Unexpected token '.'
(.venv) handrews@ixat OpenAPI-Specification % npx mdv --help
Unexpected token '.'
(.venv) handrews@ixat OpenAPI-Specification %