false positive: relative-beyond-top-level with namespace modules when specific file is processed in parallel mode

[felixfontein]

Bug description

Files with content:

a/b.py      ->      B = 1
a/c/d.py    ->      from ..b import B

If I run one of:

pylint --jobs 0 --disable=all --enable=relative-beyond-top-level --source-roots . a/
pylint --jobs 1 --disable=all --enable=relative-beyond-top-level --source-roots . a/c/d.py

everything is well. But if I run:

pylint --jobs 0 --disable=all --enable=relative-beyond-top-level --source-roots . a/c/d.py

I get an error:

************* Module d
a/c/d.py:1:0: E0402: Attempted relative import beyond top-level package (relative-beyond-top-level)

(The only potentially related bug I could find is #10147, but I'm not sure whether it's really related.)

Configuration

Command used

mkdir -p a/c
echo "B = 1" > a/b.py
echo "from ..b import B" > a/c/d.py
# These ones are successful:
pylint --jobs 0 --disable=all --enable=relative-beyond-top-level --source-roots . a/
pylint --jobs 1 --disable=all --enable=relative-beyond-top-level --source-roots . a/c/d.py
# This one is not, and produces the output shown below:
pylint --jobs 0 --disable=all --enable=relative-beyond-top-level --source-roots . a/c/d.py

Pylint output

************* Module d
a/c/d.py:1:0: E0402: Attempted relative import beyond top-level package (relative-beyond-top-level)

------------------------------------------------------------------
Your code has been rated at 0.00/10 (previous run: 0.00/10, +0.00)

Expected behavior

pylint should be successful in both calls.

Pylint version

pylint 4.0.4
astroid 4.0.2
Python 3.13.11 (main, Dec  7 2025, 13:01:45) [GCC 15.2.1 20251112]

OS / Environment

No response

Additional dependencies

[felixfontein]

CC @webknjaz - this might be related to your #10147, though this one definitely shouldn't be caused by setting the source root in a wrong way.