findings not reported until seemingly unrelated code is changed

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Bug description

# pylint: disable=missing-module-docstring
import subprocess

def __func():
    comm = None  # disable for warning in f() to appear
    # pylint: disable-next=consider-using-with
    p = subprocess.Popen('')
    try:
        comm = p.communicate(timeout=10)
    except subprocess.TimeoutExpired:
        pass
    stdout, _ = comm  # might be None
    return stdout

# pylint: disable-next=missing-function-docstring
def f():
    s = __func()
    pos = s.find(" ")
    if not pos == -1:  # unnecessary-negation
        pass

No findings are reported for f() although it contains an unnecessary-negation. This is not limited to this warning but any findings in that function.

Configuration

Command used

pylint test.py

Pylint output

no findings reported

Expected behavior

************* Module test
test.py:19:7: C0117: Consider changing "not pos == -1" to "pos != -1" (unnecessary-negation)

I would have also expected a warning about the unpacking of comm potentially not having enough values.

Pylint version

pylint 3.3.1
astroid 3.3.5
Python 3.12.7 (main, Oct  1 2024, 11:15:50) [GCC 14.2.1 20240910]

OS / Environment

Manjaro Linux, bash
Ubuntu 22.04, bash

Additional dependencies