Android Avast! Free Firewall issue

Hello,
i’m facing a little issue with my Android Phone while using Avast! Free and it’s Firewall.

The Firewall is set to use White List and special grants to port’s 80,443,995,465

To connect on my Home network i’m using VPN connection, this works all fine.

But when i’m using the Android VPN setting “Allways use VPN” (it’s not named like that but similar)
it’s connecting to my home network like allways but the apps does not have access to network while Avast! Firewall is blocking it.
If i disable the Firewall, it works fine.

Also if i grant Firewall access to the App i’m using in the White List, it works fine.

What could it be ?