Package name uppercase problem with windows image

Overview

I found a strange pip problem on windows based image related to python packages that are installed with capital letters in their folder name.

The problem is happening when uninstalling a package with uppercase letters in its name, eg: PyPDF2.

I confirm Linux images don't have this problem.

How to reproduce

Here are minimal reproducible steps:

docker pull python:3.13.3-windowsservercore-ltsc2022
docker run --rm -it python:3.13.3-windowsservercore-ltsc2022 powershell

# First install
pip install PyPDF2
python -c "import PyPDF2 as p; print(p.__file__)"

# Prints:
C:\Python\Lib\site-packages\PyPDF2\__init__.py

pip uninstall -y PyPDF2

# 2nd install
pip install PyPDF2
python -c "import PyPDF2 as p; print(p.__file__)"

# Prints:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
    import PyPDF2 as p; print(p.__file__)
    ^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'PyPDF2'

# Let's try lowercase:

python -c "import pypdf2 as p; print(p.__file__)"

# Prints:

C:\Python\Lib\site-packages\pypdf2\__init__.py

# Even if:
pip freeze

# Prints:
PyPDF2==3.0.1

Start by reproducing the reported sequence in the python:3.13.3-windowsservercore-ltsc2022 image: install PyPDF2, uninstall it, reinstall it, and compare the import paths. Inspect the Windows image behavior around pip uninstall and site-packages; done means a package with uppercase letters can be uninstalled and reinstalled while remaining importable under its expected name.