Mypy during linting behaves different than in terminal

[najtin]

Type: Bug

I use poetry and installed flake8 and mypy in a local venv using poetry. Flake works fine but mypy does not report any issues. To be clear it does report something: Success: no issues found in 1 source file But it should instead report an issue with the code.

Here is the code i want to check:

def a() -> str:
    1

Clearly, mypy should complain about the missing return statement.
Here is the output of the Output tab:

LSP Notebooks experiment is disabled -- not using Pylance
LSP Notebooks interactive window support is disabled -- not in LSP Notebooks experiment
> conda info --json
Python interpreter path: ./.venv/bin/python
> ~/.conda/bin/conda info --json
> . ./.venv/bin/activate && echo 'e8b39361-0157-4923-80e1-22d70d46dee6' && python ~/.vscode-oss/extensions/ms-python.python-2022.16.1-universal/pythonFiles/printEnvVariables.py
> ~/.julia/conda/3/bin/conda info --json
> ./.venv/bin/python ~/.vscode-oss/extensions/ms-python.python-2022.16.1-universal/pythonFiles/get_output_via_markers.py ~/.vscode-oss/extensions/ms-python.python-2022.16.1-universal/pythonFiles/interpreterInfo.py
> /bin/python ~/.vscode-oss/extensions/ms-python.python-2022.16.1-universal/pythonFiles/get_output_via_markers.py ~/.vscode-oss/extensions/ms-python.python-2022.16.1-universal/pythonFiles/interpreterInfo.py
> /usr/bin/python ~/.vscode-oss/extensions/ms-python.python-2022.16.1-universal/pythonFiles/get_output_via_markers.py ~/.vscode-oss/extensions/ms-python.python-2022.16.1-universal/pythonFiles/interpreterInfo.py
> ~/.julia/conda/3/bin/python ~/.vscode-oss/extensions/ms-python.python-2022.16.1-universal/pythonFiles/get_output_via_markers.py ~/.vscode-oss/extensions/ms-python.python-2022.16.1-universal/pythonFiles/interpreterInfo.py
Starting Jedi language server for rootsnakes.
> ./.venv/bin/python ~/.vscode-oss/extensions/ms-python.python-2022.16.1-universal/pythonFiles/linter.py -m mypy --follow-imports=silent --ignore-missing-imports --show-column-numbers --no-pretty ./rootsnakes/app.py
cwd: .
> ./.venv/bin/python ~/.vscode-oss/extensions/ms-python.python-2022.16.1-universal/pythonFiles/linter.py -m flake8 ./rootsnakes/app.py
cwd: .
##########Linting Output - mypy##########

Success: no issues found in 1 source file

##########Linting Output - flake8##########

When we run the exact same command in the terminal window (with venv activated) or in a fresh shell without activating the venv we get the expected result:

./.venv/bin/python ~/.vscode-oss/extensions/ms-python.python-2022.16.1-universal/pythonFiles/linter.py -m mypy --follow-imports=silent --ignore-missing-imports --show-column-numbers --no-pretty ./lol.py
lol.py:1:1: error: Missing return statement  [return]
Found 1 error in 1 file (checked 1 source file)

Extension version: 2022.16.1
VSCodium version: VSCodium 1.72.2 (378660f7dd07287aa34acf90e8fec157425c1ac8, 2022-10-16T23:03:19.989Z)
OS version: Linux x64 5.15.0-52-generic snap
Modes:
Sandboxed: No

System Info

Item	Value
CPUs	-
GPU Status	-
Load (avg)	1, 0, 0
Memory (System)	15.19GB (3.28GB free)
Process Argv	--ms-enable-electron-run-as-node --no-sandbox --unity-launch
Screen Reader	no
VM	0%
DESKTOP_SESSION	mate
XDG_CURRENT_DESKTOP	MATE
XDG_SESSION_DESKTOP	mate
XDG_SESSION_TYPE	x11

[najtin]

duplicate of #20182