Arch Linux

Description:
Greetings!
I can not update arch linux after 08/18/2020. The reason is the inability to enter the system (SDDM or via TTY2 does not matter). I have three users on my computer and cannot log in to the system. When I try to update the system with "Server = https://archive.archlinux.org/repos/2020/08/19/$repo/os/$arch " OR with "pacman -Syyu" (08/20/2020,21.08. 2020, 22.08.2020), then the opportunity to enter the system disappears again.

I tried booting from Archlinux liveCD and changing the password forcibly using "passwd". After that it is still not possible to log in.

P.S.
Returning with "Server = https://archive.archlinux.org/repos/2020/08/18/$repo/os/$arch " to mirrorlist and "pacman -Syyuu" solves the problem.

Additional info:
* package version(s)
* config and/or log files etc.
* link to upstream bug report, if any

Steps to reproduce:
Update system (pacman -Syyu). Core: Linux 5.8.1-arch1-1