Problem with pandas and lxml library

Hello,

I use pandas for an app I am writing. I use the function pandas.read_html to retrieve extract tables from a web page. I understand that that function requires lxml

The program itself is working but when I integrate it in appdaemon it complains that lxml is not installed.
Here is the config I have for appdaemon.

{
  "disable_auto_token": false,
  "system_packages": [
    "python3-dev",
    "gcc",
    "musl-dev",
    "g++"
  ],
  "python_packages": [
    "lxml",
    "pandas"
  ],
  "log_level": "info"
}

I have tried several thing but still it doesn’t see lxml and so my app is not working.

Any idea what I am doing wrong ?