Third-party incorrectly identify as First-party depending on the name of the root directory

Third-party packages are incorrectly identify as First-party depending on the name of the root directory. I can't find a setting to override this behaviour. Example:

tree:

some_name
|-package_name
|--__init__.py
|--file1.py
|-tests
|-docs
|-pyproject.toml

What isort thinks it should be:

import datetime

import third_party

from package_name.file1 import xyz
from some_name import xyz

What it should be:

import datetime

import third_party
from some_name import xyz

from package_name.file1 import xyz

If I rename the root directory (some_name -> some_other_name), but this means for the CI run I have to also rename the repository.

Reproduce the classification using the shown package tree, including pyproject.toml, package_name/init.py, and file1.py, while changing only the root directory name. Trace the import classification entry point and verify that package_name remains third-party and some_name remains first-party regardless of the root directory name.