This points to the file /etc/resolv.conf not being reset.
This can be fixed by removing openresolv and switch the system to systemd-resolved.
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Remove openresolv or resolvconf - whichever is installed
sudo pacman -R openresolvEnable systemd-resolved
sudo systemctl enable --now systemd-resolvedBackup the existing resolv.conf
sudo mv /etc/resolv.conf /etc/resolv.conf.bakCreate a symlink to stub-resolv.conf
sudo ln -s /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf
If preferred it is possible with a simple custom PKGBUILD https://aur.archlinux.org/packages/resolvconf-symlink-systemd-stub