https://micronews.debian.org/2023/1702150551.html
> Due to an issue in ext4 with data corruption in kernel 6.1.64-1, we are a > 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 > UnattendeUpgrades configured. Please see bug# 1057843: > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1057843 - rob