wpa_supplicant 2:2.10-8 dated Dec 28 2022 works.
wpa_supplicant 2:2.11.1 dated Jul 24 2024 fails.
But if you have cleaned out your
/var/cache/pacman/pkg
directory since Dec 28 2022 then version 2:2.10-8 may not exist. If so, downgrade probably won’t work.
One can get older versions of wpa_supplicant from the Archlinux archive
https://archive.archlinux.org/packages/w/wpa_supplicant/
You only need the .pkg.tar.zst package and not the .pkg.tar.zst.sig (signature).
Then go to the directory where wpa_supplicant was downloaded
sudo pacman -U wpa_supplicant-2:2.10-8-x86_64.pkg.tar.zst
then reboot.
Pudge
EDIT:
For the Archlinux ARM archive go here
https://alaa.ad24.cz/packages/w/wpa_supplicant/
Then go to the directory where wpa_supplicant was downloaded
sudo pacman -U wpa_supplicant-2:2.10-8-aarch64.pkg.tar.xz
Then reboot