Very often python comes with an old pip version which may produce different kinds of problems. After using pip command in a fresh virtual environment, user usually sees a text like this:
WARNING: You are using pip version 20.2.1; however, version 21.3.1 is available.
You should consider upgrading via the 'c:\python\venvs\someproj\scripts\python.exe -m pip install --upgrade pip' command.
it might be actually handy to have the venvlink new venv creation process to automatically do this. This could be also an option in the venvlinkrc.