Environment data

• VS Code version: 1.47.3
• Extension version (available under the Extensions sidebar): v2020.7.96456
• OS and version: Ubuntu 20.04
• Python version: 3.8.3 (installed by pyenv)
• Type of virtual environment used: pyenv-virtualenv
• Relevant/affected Python packages and their versions: XXX
• Relevant/affected Python-related VS Code extensions and their versions: XXX
• Value of the python.languageServer setting: doesn't seem to matter; I have tried Jedi, Microsoft, Pylance, and None
• isort version: 4.3.21

Expected behaviour

When I hit save on a Python file, I expect it to quickly/automatically sort my imports

Actual behaviour

It pops up a box much like this one:

Saving 'main.py': Applying code action 'Sort imports'.

And that box never goes away. It hangs indefinitely. Obviously it never actually sorts my imports either, nor does it proceed to linting / auto-formatting. It just gets stuck.

Steps to reproduce:

1. pip install black pylint isort autoflake
2. Copy my settings.json file
3. Save a Python file

Logs

> ~/.pyenv/versions/myproject/bin/python ~/.vscode/extensions/ms-python.python-2020.7.96456/pythonFiles/pyvsc-run-isolated.py ~/.vscode/extensions/ms-python.python-2020.7.96456/pythonFiles/sortImports.py - --diff
cwd: ~/src/myproject/home
> ~/.pyenv/versions/myproject/bin/python ~/.vscode/extensions/ms-python.python-2020.7.96456/pythonFiles/pyvsc-run-isolated.py ~/.vscode/extensions/ms-python.python-2020.7.96456/pythonFiles/sortImports.py - --diff
cwd: ~/src/myproject/home