Pytest doen't rewrite conftest plugins

As per discussed:

I try to run pytest rewriting for custom plugins. However it doesn't load a conftest plugin at the rewrting stage.

Example:

https://github.com/Tusenka/pytest/tree/disable_assertion_rewriting_external_modules/testing/example_scripts/rewrite

Expected result:

It sees the conftest plugin "some_plugin "for rewritng.

Result:

It doesn't see conftest plugins:

Result of provided plugins:
['pytest', 'zope.interface', 'idna', 'anyio', 'sniffio', 'filelock', 'cachetools', 'incremental', 'greenlet', 'pluggy', 'hypothesis', 'Automat', 'wheel', 'virtualenv', 'coverage', 'pip', 'distlib', 'mock', 'pre_commit', 'typing_extensions', 'elementpath', 'pytest-twisted', 'PyYAML', 'pyproject-api', 'identify', 'colorama', 'urllib3', 'hyperlink', 'Pygments', 'sortedcontainers', 'constantly', 'nodeenv', 'xmlschema', 'setuptools', 'attrs', 'requests', 'pytest', 'exceptiongroup', 'decorator', 'platformdirs', 'packaging', 'charset-normalizer', 'cfgv', 'Twisted', 'certifi', 'chardet', 'tox', 'argcomplete', 'iniconfig', 'jaraco.collections', 'zipp', 'typeguard', 'wheel', 'importlib_metadata', 'jaraco.text', 'jaraco.context', 'autocommand', 'tomli', 'typing_extensions', 'more-itertools', 'jaraco.functools', 'packaging', 'platformdirs', 'inflect', 'backports.tarfile']

`https://github.com/pytest-dev/pytest/blob/9e9633de9da7a9fab03b4bba3a326bf85b412050/src/_pytest/config/__init__.py#L1293

Pip info:

anyio 4.9.0
argcomplete 3.6.2
attrs 25.3.0
Automat 25.4.16
cachetools 5.5.2
certifi 2025.4.26
cfgv 3.4.0
chardet 5.2.0
charset-normalizer 3.4.2
colorama 0.4.6
constantly 23.10.4
coverage 7.8.0
decorator 5.2.1
distlib 0.3.9
elementpath 5.0.0
exceptiongroup 1.3.0
filelock 3.18.0
greenlet 3.2.2
hyperlink 21.0.0
hypothesis 6.131.9
identify 2.6.12
idna 3.10
incremental 24.7.2
iniconfig 2.1.0
mock 5.2.0
nodeenv 1.9.1
packaging 25.0
pip 25.0.1
platformdirs 4.3.8
pluggy 1.5.0
pre_commit 4.2.0
Pygments 2.19.1
pyproject-api 1.9.1
pytest 8.5.0.dev32+g1d5a61269.d20250613 /home/cas12/PycharmProjects/pytest-play
pytest-twisted 1.14.3
PyYAML 6.0.2
requests 2.32.3
setuptools 78.1.0
sniffio 1.3.1
sortedcontainers 2.4.0
tox 4.26.0
Twisted 24.11.0
typing_extensions 4.13.2
urllib3 2.4.0
virtualenv 20.31.2
wheel 0.45.1
xmlschema 4.0.1
zope.interface 7.2

Pytest and OS:

• a detailed description of the bug or problem you are having
• output of pip list from the virtual environment you are using
• pytest and operating system versions
• minimal example if possible

Start with the provided reproduction under testing/example_scripts/rewrite and inspect src/_pytest/config/init.py around line 1293. Trace how assertion rewriting discovers plugins and compare the observed list with the expected conftest plugin. Done means the reproduction detects and rewrites the conftest plugin without regressing existing plugin handling.