A fixture defined in a class is not itself!? (since 8.4.0)

[maread99]

import pytest

class TestCls:
    @pytest.fixture
    def a_fixture():
        yield

TestCls.a_fixture is TestCls.a_fixture

False

TestCls.a_fixture == TestCls.a_fixture

False

Prior to 8.4.0 both these statements returned True, as might be expected...?

Perhaps this is related to #13479?

This came to my attention as a result of this test failing. The test ensures some fixtures aren't being overridden by a subclass. If the issue I've raised here isn't considered a bug, perhaps you could you suggest an alternative means to verify that fixtures aren't being overridden?

Thank you!

os: windows
environment:

Package               Version
--------------------- -----------
asttokens             3.0.0
attrs                 25.3.0
build                 1.3.0
click                 8.3.0
colorama              0.4.6
comm                  0.2.3
debugpy               1.8.17
decorator             5.2.1
exceptiongroup        1.3.0
execnet               2.1.1
executing             2.2.1
hypothesis            6.140.2
iniconfig             2.1.0
ipykernel             6.30.1
ipython               8.37.0
jedi                  0.19.2
jupyter_client        8.6.3
jupyter_core          5.8.1
korean-lunar-calendar 0.3.1
matplotlib-inline     0.1.7
nest-asyncio          1.6.0
numpy                 2.2.6
packaging             25.0
pandas                2.3.2
parso                 0.8.5
pip                   25.2
pip-tools             7.5.0
platformdirs          4.4.0
pluggy                1.6.0
prompt_toolkit        3.0.52
psutil                7.1.0
pure_eval             0.2.3
py-cpuinfo            9.0.0
Pygments              2.19.2
pyluach               2.3.0
pyproject_hooks       1.2.0
pytest                8.4.2
pytest-benchmark      5.1.0
pytest-xdist          3.8.0
python-dateutil       2.9.0.post0
pytz                  2025.2
pywin32               311
pyzmq                 27.1.0
ruff                  0.13.1
setuptools            58.1.0
six                   1.17.0
sortedcontainers      2.4.0
stack-data            0.6.3
tomli                 2.2.1
toolz                 1.0.0
tornado               6.5.2
traitlets             5.14.3
typing_extensions     4.15.0
tzdata                2025.2
wcwidth               0.2.14
wheel                 0.45.1

• 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