cscs
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I believe you may have stumbled upon a recent issue with plymouth.
(the boot splash screen… graphics you see before logging in)
If you are able to run updates again it should be fixed.
sudo pacman -Syuu
If you have trouble gaining interaction then please see this guide:
If you need/want to disable plymouth or remove it entirely you can also see this guide:
For more information in general on the plymouth stuff please see recent threads, including the most recent update announcement thread.
(ex, https://forum.manjaro.org/t/stable-update-2024-02-21-kernels-kde-virtualbox-calamares-rocm-firefox-thunderbird/)