When opening a new terminal, Python venv is activated twice

This started recently. Whenever I open a new terminal window, the command source /home/vscode/.venv/bin/activate is run twice. The second one runs after a few seconds, which mean it manages to interrupt whatever I'm typing at the moment.
Here's what it looks like in the terminal (bash):

source /home/vscode/.venv/bin/activate
vscode ➜ /workspace (fix-uploaded-files-same-name) $ source /home/vscode/.venv/bin/activate
(.venv) vscode ➜ /workspace (fix-uploaded-files-same-name) $  source /home/vscode/.venv/bin/activate
(.venv) vscode ➜ /workspace (fix-uploaded-files-same-name) $

Output for the Python Environments extension:

2026-03-06 09:14:44.127 [debug] Activating terminal: /home/vscode/.venv/bin/python
2026-03-06 09:14:44.144 [debug] Shell execution started:  source /home/vscode/.venv/bin/activate
2026-03-06 09:14:44.144 [info] Terminal is activated: /home/vscode/.venv/bin/python

Output for the Python extension:

2026-03-06 09:14:43.907 [debug] Terminal name '' identified as shell 'other'
2026-03-06 09:14:43.907 [debug] Terminal shell path '/bin/bash' identified as shell 'bash'
2026-03-06 09:14:43.907 [debug] Shell identified as bash (Terminal name is )
2026-03-06 09:14:43.909 [debug] could not find a pixi interpreter for the interpreter at /home/vscode/.venv/bin/python
2026-03-06 09:14:43.943 [debug] Command sent to terminal: source /home/vscode/.venv/bin/activate
2026-03-06 09:14:43.943 [info] Send text to terminal: source /home/vscode/.venv/bin/activate
2026-03-06 09:14:44.154 [debug] Received shell integration sequence for bash
2026-03-06 09:14:44.201 [debug] Received shell integration sequence for bash
2026-03-06 09:14:48.997 [debug] Received shell integration sequence for bash

I'm using VSCode on Windows with a devcontainer in WSL2. Please let me know if you need more context.

EDIT: I added logging for Python extension as well
EDIT 2: Looking at the settings, the Python extension had "Activate environment" enabled. But disabling that, then the Python Environments extension did not activate the environment at all.