Hello everyone,
I now have a 100% repeatable bug so can post it here.
The bug: my ethernet interface is not "seen" by bitdefender and therefore paranoid mode is not working, allowing every program to connect to the internet!
How to reproduce:
1) repair bitdefender install using the "apps & features" window of windows 10: click uninstall for bitdefender, select repair in the window
2) reboot the computer
3) enable paranoid mode, see your ethernet adapter correctly detected, see the correct connection prompts appearing
4) reboot computer
5) bitdefender lost the ethernet adapter, all programs are allowed to connect to the internet!