[Python] Can't pip install requirements in Python3.12 venv on macOS

Trying to set up a Python3.12 (installed via Homebrew) venv on macOS Sonoma 14.4.1 but completely unable to use pip.

python3 -m venv .venv
source .venv/bin/activate
python3 -m ensurepip
python3 -m pip install -r requirements.txt


Always results in "ModuleNotFoundError: No module named 'pip'"

It's very confusing, I thought pip came with Python already? And the python3 -m ensurepip results in: "Successfully installed pip-24.2". I've tried all combinations of python/python3 pip/pip3. I also tried python3 -m install numpy (just one package) with the same result.

What am I doing wrong?

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