passing pathlib.Path object to subprocess.run causes pydevd error only when debugging

[MatrixManAtYrService]

Environment data

• VS Code version: March 2021 (version 1.55)
• Extension version: v2021.4.765268190
• OS and version: Mac OS Big Sur 11.3
• Python version: Python 3.9.4
• Type of virtual environment used: N/A
• python.languageServer: jedi

Trouble Code

import subprocess
from pathlib import Path

project_path = Path("./dummyproject")
script = (project_path / 'addone.sh')

subprocess.run([script, "42"])    # causes error only with debugger
subprocess.run([str(script), "42"]).   # works in either case

# addone.sh

#! /usr/bin/env bash
echo "$1 + 1" | bc

Expected behaviour

run without debugging:

❯  cd /Users/matt/src/tdid-proj ; /usr/bin/env /usr/bin/python3 /Users/matt/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/python/debugpy/launcher 57904 -- /Users/matt/src/tdid-proj/dummyproject-test/fingerprints/bug.py ./dummyproject 
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start debugging:

❯  cd /Users/matt/src/tdid-proj ; /usr/bin/env /usr/bin/python3 /Users/matt/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/python/debugpy/launcher 57911 -- /Users/matt/src/tdid-proj/dummyproject-test/fingerprints/bug.py ./dummyproject
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Actual behaviour

run without debugging:

❯  cd /Users/matt/src/tdid-proj ; /usr/bin/env /usr/bin/python3 /Users/matt/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/python/debugpy/launcher 57904 -- /Users/matt/src/tdid-proj/dummyproject-test/fingerprints/bug.py ./dummyproject 
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start debugging:

❯  cd /Users/matt/src/tdid-proj ; /usr/bin/env /usr/bin/python3 /Users/matt/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/python/debugpy/launcher 57883 -- /Users/matt/src/tdid-proj/dummyproject-test/fingerprints/bug.py ./dummyproject 
Error patching args (debugger not attached to subprocess).
Traceback (most recent call last):
  File "/Users/matt/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/python/debugpy/_vendored/pydevd/_pydev_bundle/pydev_monkey.py", line 243, in patch_args
    if not is_python(unquoted_args[0]):
  File "/Users/matt/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/python/debugpy/_vendored/pydevd/_pydev_bundle/pydev_monkey.py", line 152, in is_python
    single_quote, double_quote = _get_str_type_compatible(path, ["'", '"'])
  File "/Users/matt/.vscode/extensions/ms-python.python-2021.4.765268190/pythonFiles/lib/python/debugpy/_vendored/pydevd/_pydev_bundle/pydev_monkey.py", line 136, in _get_str_type_compatible
    ret.append(arg.decode('utf-8'))
AttributeError: 'str' object has no attribute 'decode'
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Steps to reproduce:

Pass a pathlib.Path object to subprocess.run. Notice that:

• the debugger fails to attach to the subprocess (fine)
• errors show up in the output that don't show up without the debugger (not fine)

Workaround

Cast the pathllib.Path object to a string first

Resoning

I never wanted to attach the debugger to the subprocess in the first place. I'm OK with the fact that it failed. But it should faill in a way that doesn't clutter up stdout and make me think my code is broken. Also, more useful errors would be nice.

Thank you.