Django/SCSS: staticfiles manifest staticfiles.json with empty paths


I develop Django app using bootstrap frameworks and want to be able to customize using scss.
Stack: Django/Nginx/Postgresql/Docker

I have followed tutorials but have issues serving static files, probably because of settings.
I can make it work in dev environnement but not in my preprod (nginx).

To be honest, I found static management not so easy event f I have read many times documentation.

I have open a post on stackoverflow here.

To resume, statics files are loaded in the right folder in my docker web container as well as the manifest staticfiles.json but there is no paths in this manifest.
So when I try to run I got an error:
valueerror: missing staticfiles manifest entry for ‘theme.scss’

Hope someone can help me understand…