QuartzDragon [1] filed a orphan request for linux-bcachefs-git [2]: This package has been marked as out-of-date for many months now, and the bcachefs code has been rebased to work with 4.19, so I wouldn't mind taking over the package.
[1] https://aur.archlinux.org/account/QuartzDragon/ [2] https://aur.archlinux.org/pkgbase/linux-bcachefs-git/