Removing a TNT global address then adding a new one does not work

[MrKevinWeiss]

Description

While running the release specs I attempted to remove a global address given by a stray border router (withTNT). I would change the channel or PAN ID before, remove it so it would no longer get an address, then add a known address. However, even though the address was in ifconfig it wasn't able to ping. Pinging the local address worked, and if I didn't have to remove any TNT addresses it also worked.

Steps to reproduce the issue

Check RIOT-OS/Release-Specs#299 and run it with a border router operating.

Expected results

Pinging the added global address works.

Actual results

100% packet loss.

Versions

Run with release spec tox env on ubuntu 22.04.