https://micronews.debian.org/2023/1702150551.html
Due to an issue in ext4 with data corruption in kernel 6.1.64-1, we are pausing the 12.3 image release for today while we attend to fixes. Please do not update any systems at this time, we urge caution for users with UnattendedUpgrades configured. Please see bug# 1057843: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1057843
I don’t understand why they haven’t pulled the update… it is still in the repo and your system will upgrade to it if you run apt update.