As a quick kludge use an USB-C wlan network adapter that lacks the functionality for this type of connection (albeit that won't help you with a cellular connection)?

Regarding cellular connection, the proof of concept presented here only works on wifi: https://github.com/GrapheneOS/os-issue-tracker/issues/8617

I have a hunch this leak is bound to wifi hardware only, for details: https://supuk.ch/papers/android-natt-keepalive-vpn-bypass