yochananmarqos [1] filed a deletion request for pamac-zsh-completions [2]: Pamac has included ZSH completions since v10.2.2 released in 2021 and this conflicts with it.
See: https://gitlab.manjaro.org/applications/pamac/-/commit/467213a1b316b3f2e5e22090a4842be851e776ac [1] https://aur.archlinux.org/account/yochananmarqos/ [2] https://aur.archlinux.org/pkgbase/pamac-zsh-completions/
