ShalokShalom [1] filed a request to merge chainner-bin [2] into chainner20-bin [3]:

I would continue to maintain this package

[1] https://aur.archlinux.org/account/ShalokShalom/ [2] https://aur.archlinux.org/pkgbase/chainner-bin/ [3] https://aur.archlinux.org/pkgbase/chainner20-bin/

Merge target is a duplicate which should not have been uploaded in first place, if you want to help post an updated pkgbuild in the comments A legit oprhan request for chainner-bin [PRQ#46840] is peding since 29/08/23