[Python] Remote debugging with debugpy works from code but not from command line

I have a python binary (which is built using bazel but I don't think that's relevant) that I can run like this:

$ bazel-bin/path/to/my_test

----------------------------------------------------------------------
Ran 5 tests in 0.228s

OK


I want to use debugpy to debug this binary in Visual Studio Code. I can go the file I want to debug and add

import debugpy
debugpy.listen(('0.0.0.0', 5678))
debugpy.wait_for_client()


Build and run the binary, it starts waiting for the client, then I use this vscode config

{
"version": "0.2.0",
"configurations": [
{
"name": "Python: Remote Attach",
"type": "python",
"request": "attach",
"host": "127.0.0.1",
"port": 5678,
}
]
}


Everything works fine. I can put breakpoints, jump around the code, perfect.

Now, if instead of adding the code at top, I do:

python3 -m debugpy --listen 0.0.0.0:5678 --wait-for-client bazel-bin/path/to/my_test


It looks like the client is waiting for connections. Then I start remote debugging on vscode and... nothing happens. The debugger starts and finishes in a second. I see no logs, no errors.

Where can I find logs to see what's going on on either the client side or vscode?

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