First of all, uninstall the eos-hooks package, which keeps changing the data of /etc/os-release from a hook while installing base packages.

sudo pacman -R eos-hooks

Reinstall the base package group:

sudo pacman -Syyu --noconfirm archlinux-keyring bash bzip2 lsb-release coreutils file filesystem findutils gawk gcc-libs gettext glibc grep gzip iproute2 iputils licenses pacman pciutils procps-ng psmisc sed shadow systemd systemd-sysvcompat tar util-linux xz linux