gProfile shows only [unknown] frames (Python, Docker)

I'm trying a very basic Flask-Python app:

```python
from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello_world():
return 'Hello, World!'
```

Deployed it in a Docker container, then added gProfiler to Docker as described in docs: https://docs.gprofiler.io/about-gprofiler/installing-gprofiler/docker

After initiating my code to run several times, all I see in the profile is calls to "[unknown]" – no trace of calls to `hello_world` anywhere (even, though I have "Hello, World!" printed multiple times – I know the code was executed):

Yellow blocks related to Python only contain calls to Flask.

I also tried a couple of open-source projects cloned from various sources – the result is the same.

I'm using macOS 12.5.1 on Apple M1, Python 3.7.1, and Docker Desktop 4.12.0.