vscode-python: "write EPIPE" error when running "Python Refactor: Sort Imports"

Environment data

• VS Code version: Version: 1.48.0-insider
• Extension version (available under the Extensions sidebar): v2020.7.94776
• OS and version: MacOS 10.14.6 (AMD hackintosh if that matters)
• Python version (& distribution if applicable, e.g. Anaconda): Python 3.8.2
• Type of virtual environment used (N/A | venv | virtualenv | conda | …): virtualenv
• Relevant/affected Python packages and their versions: isort 4.3.21
• Relevant/affected Python-related VS Code extensions and their versions: N/A
• Value of the python.languageServer setting: Jedi

Expected behaviour

Given input file main.py:

from typing import List, Optional
from datetime import datetime

print("Hello World")

Using the python extension’s “Python Refactor: Sort Imports” command, it should rearrange the imports in alphabetical order to the following:

from datetime import datetime
from typing import List, Optional

print("Hello World")

Actual behaviour

After pressing cmd+shift+P and selecting “Python Refactor: Sort Imports”, I get this little error popup saying “write EPIPE” (see image).

NOTE: this works properly when runningisort main.py manually from the terminal

Steps to reproduce:

./.vscode/settings.json

{
    "python.pythonPath": "venv/bin/python",
    "python.sortImports.path": "isort"
}

1. create file main.py above
2. create a virtual environment - virtualenv venv
3. activate virtual environment - source venv/bin/activate
4. install isort dependency - pip install isort
5. Open command palette (cmd+shift+P on mac)
6. Search “Python Refactor: Sort Imports” and select the correct command
7. Press Enter

Logs

N/A