`pkgutil.get_data()` get confused by local modules for module installed with `pip install --editable`

Bug report

Bug description:

First execute in bash:

git clone https://github.com/pyx-project/pyx
cd pyx
pip install -e .
cd pyx  # important! Now the directory is inside two layers of /pyx
python

Then execute in Python:

import pkgutil
pkgutil.get_data("pyx", "data/pyxrc")

Return value is None.

Note that the return value would not be None if either -e or the second cd is omitted --- which shows that the data file is correctly available.

CPython versions tested on:

3.11

Operating systems tested on:

No response

重現報告中的 bash 和 Python 步驟，聚焦於 pip install -e . 之後的 pkgutil.get_data 入口點，以及巢狀的 cd pyx。追蹤它為什麼在該情境下對 data/pyxrc 回傳 None，然後驗證相同的查找無需任一因應方案即可回傳可用資料。