@Ganzjahresgriller I just did the upgrade. No issues, having blocked exim beforehand as per blog post.
root@hx2 ~ $ uname -a
Linux xxx.xxx.xx 6.12.41+deb13-arm64 #1 SMP Debian 6.12.41-1 (2025-08-12) aarch64 GNU/Linux
root@hx2 ~ $ cat /etc/debian_version
13.0