MarsSeed [1] filed a deletion request for shadow-beta [2]: Broken, abandoned beta package from 2020.
Not related to Arch/core/shadow, so the name is misleading. It was for the beta variant of shadow-tech, maintained and available on AUR. [a] I think it's better to delete this abandoned pkg and keep only the latter. [a]: https://aur.archlinux.org/packages/shadow-tech [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/shadow-beta/
