Python 3.12 cannot import local python files as modules

[Gribouillis]

Yeah, I'm not sure why Python 3.11 is adding my project folder to sys.path but 3.12 isn't?

I don't understand it either. It may be a Windows-specific issue but I never use the Windows OS.

It is not very satisfactory but you could add the following lines in your sitecustomize or your usercustomize module to force the inclusion of the main script's directory in sys.path

from pathlib import Path
import sys

if sys.argv:
    sys.path.insert(0, str(Path(sys.argv[0]).resolve().parent))