sphinx-markdown-builder unknown node type desc_returns

conf.py

extensions = ["sphinx.ext.autodoc", "sphinx_markdown_builder"]

foo.py

"Hello, World!"


def foo(bar: str) -> int:
    "Foo!"
    return len(bar)

index.rst

foo

Makefile

.PHONY: docs clean
docs:
	PYTHONPATH=. sphinx-build -M markdown . output
clean:
	rm -rf output

requirements.txt

sphinx == 7.2.6
sphinx-markdown-builder == 0.6.6