Just updated in unstable and could no longer login at all. It appears to be an issue with pam, and it was fixed by chrooting through a live session and switching to testing then downgrade. Just letting you know so you can test it out and possibly hold back the update from stable until it is resolved.
A post was merged into an existing topic: [Unstable Update] 2020-08-19 - Nvidia 450.66, Deepin, Pamac, KDE-git, Python, Haskell