Overridden classmethod documentation not inherited with autodoc

[EpicWink]

Describe the bug

The documentation for a classmethod in a parent class is not inherited by the method re-defined (without documentation) in a child class

How to Reproduce

Module src/spam.py:

class Parent:
    @classmethod
    def method(cls) -> int:
        """Return an integer."""
        return 17


class Child(Parent):
    @classmethod
    def method(cls):
        return 42

Sphinx configuration docs/conf.py:

project = "spam"
extensions = ["sphinx.ext.autodoc"]

Documentation index docs/index.rst:

spam
====

.. automodule:: spam
   :members:
   :undoc-members:

Build:

PYTHONPATH=src sphinx-build docs/ build

Expected behavior

Overridden classmethod to inherit documentation from parent class

Your project

https://github.com/EpicWink/python-swf-typed

Screenshots

OS

Ubuntu 20.04

Python version

3.8

Sphinx version

4.2.0

Sphinx extensions

sphinx.ext.autodoc

Additional context

inspect.getdoc(Child.method) returns the expected value

[tk0miya]

By default, autodoc searches the docstring from the parent class. Please disable autodoc_inherit_docstrings.
https://www.sphinx-doc.org/en/master/usage/extensions/autodoc.html#confval-autodoc_inherit_docstrings

[EpicWink]

Setting autodoc_inherit_docstrings = False didn't fix it. As a matter of fact, it (as the name suggests) disabled inheritance of docstrings for all methods, not just classmethods. Also, explicitly setting autodoc_inherit_docstrings = True didn't fix it

This to me seems like a bug specific to classmethods

[EpicWink]

@tk0miya I don't think this issue is resolved

[tk0miya]

Okay, I'll take a look.

[tk0miya]

Sorry, I misunderstand your report. Reproduced the error on my local.