Not installing under pipx

[vorpalhex]

I realize this is more "feature request" than "bug report" since pipx isn't mentioned as a supported install method.

pipx handles making each pip install it's own venv to prevent dependency hell between conflicting apps. It's a utility around pip that just makes life easier. Project page is here: https://pypa.github.io/pipx/

Normally pipx should just work for any pip program, but I'm getting the following error:

pipx install humblebundle-downloader
  error: subprocess-exited-with-error

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [20 lines of output]
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/tmp/pip-install-yd3man9q/humblebundle-downloader_2c6b9a727e3f4ba08c3f97fb0eef3bab/setup.py", line 8, in <module>
          setup(
        File "/home/user/.local/pipx/shared/lib/python3.8/site-packages/setuptools/__init__.py", 
line 155, in setup
          return distutils.core.setup(**attrs)
        File "/home/user/.local/pipx/shared/lib/python3.8/site-packages/setuptools/_distutils/core.py", line 109, in setup
          _setup_distribution = dist = klass(attrs)
        File "/home/user/.local/pipx/shared/lib/python3.8/site-packages/setuptools/dist.py", line 458, in __init__
          _Distribution.__init__(
        File "/home/user/.local/pipx/shared/lib/python3.8/site-packages/setuptools/_distutils/dist.py", line 293, in __init__
          self.finalize_options()
        File "/home/user/.local/pipx/shared/lib/python3.8/site-packages/setuptools/dist.py", line 850, in finalize_options
          for ep in sorted(loaded, key=by_order):
        File "/home/user/.local/pipx/shared/lib/python3.8/site-packages/setuptools/dist.py", line 849, in <lambda>
          loaded = map(lambda e: e.load(), filtered)
        File "/home/user/.local/pipx/shared/lib/python3.8/site-packages/setuptools/_vendor/importlib_metadata/__init__.py", line 196, in load
          return functools.reduce(getattr, attrs, module)
      AttributeError: type object 'Distribution' has no attribute '_finalize_feature_opts'        
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

Error installing humblebundle-downloader.

This is on Ubuntu 20.04 LTS,, x86-64. Install DID work under pip proper.