VersionConflict error running pip with setuptools 47.3.0

gistfile1.txt

$ virtualenv --system-site-packages ~/piptest -p python3
Already using interpreter /usr/bin/python3
Using base prefix '/usr'
New python executable in ~/piptest/bin/python3
Also creating executable in ~/piptest/bin/python
Installing setuptools, pip, wheel...
done.

$ source ~/piptest/bin/activate
(piptest) $ pip list
Package               Version
--------------------- -------------------
packaging             20.3
pip                   20.1.1
pyasn1                0.4.2
pyasn1-modules        0.2.1
python-apt            1.9.10
python-augeas         0.5.0
python-debian         0.1.36
python-magic          0.4.16
python-mimeparse      1.6.0
python-networkmanager 2.1
python-pam            1.8.4
python-xapp           1.8.1
python-xlib           0.26
setuptools            47.3.0
six                   1.14.0
virtualenv            16.7.7
wheel                 0.34.2

(piptest) $ easy_install -U pip
WARNING: The easy_install command is deprecated and will be removed in a future version.
Searching for pip
Reading https://pypi.org/simple/pip/
Downloading https://files.pythonhosted.org/packages/fe/3b/0fc5e63eb277d5a50a95ce5c896f742ef243be27382303a4a44dd0197e29/pip-20.2b1-py2.py3-none-any.whl#sha256=b4e230e2b8ece18c5a19b818f3c20a8d4eeac8172962779fd9898d7c4ceb1636
Best match: pip 20.2b1
Processing pip-20.2b1-py2.py3-none-any.whl
Installing pip-20.2b1-py2.py3-none-any.whl to ~/piptest/lib/python3.7/site-packages
Adding pip 20.2b1 to easy-install.pth file
Installing pip script to ~/piptest/bin
Installing pip3 script to ~/piptest/bin
Installing pip3.8 script to ~/piptest/bin

Installed ~/piptest/lib/python3.7/site-packages/pip-20.2b1-py3.7.egg
Processing dependencies for pip
Finished processing dependencies for pip

(piptest) $ pip
Traceback (most recent call last):
  File "~/piptest/bin/pip", line 30, in <module>
    sys.exit(load_entry_point('pip==20.2b1', 'console_scripts', 'pip')())
  File "~/piptest/lib/python3.7/site-packages/pkg_resources/__init__.py", line 490, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "~/piptest/lib/python3.7/site-packages/pkg_resources/__init__.py", line 482, in get_distribution
    dist = get_provider(dist)
  File "~/piptest/lib/python3.7/site-packages/pkg_resources/__init__.py", line 358, in get_provider
    return working_set.find(moduleOrReq) or require(str(moduleOrReq))[0]
  File "~/piptest/lib/python3.7/site-packages/pkg_resources/__init__.py", line 644, in find
    raise VersionConflict(dist, req)
pkg_resources.VersionConflict: (pip 20.1.1 (~/piptest/lib/python3.7/site-packages), Requirement.parse('pip==20.2b1'))

(piptest) $