Alad  filed an orphan request for plasma-workspace-git :
Can't be build because of dependency loops, see comments
 https://aur.archlinux.org/account/Alad/  https://aur.archlinux.org/pkgbase/plasma-workspace-git/
Request #32733 has been Rejected by ainola :
I'd advise engaging the maintainer to try to fix the issue; they seem responsive and aware of the problem.