Manjaro broke after an update. Login screen freezes and blinks

You skipped the disable extensions part - and your comments is not very elaborating - I recognize you do your best …

There seems to be more to your systems dysfuncitonality - did you do a power off or did the system sleep or hibernate during the process?

I think down that lane - and you were already

There several methods to bring into play - they are spread over various topics in the Tutorials section

curl -O https://gitlab.com/cscs/mapare/-/raw/main/mapare
bash mapare -I