Just an FYI I'm getting this issue on my TKL containers where sshd stops running, version below.

It seems there was a recent update that caused it.

Workaround 1 to fix it from here:

https://askubuntu.com/questions/1109934/ssh-server-stops-working-after-reboot-caused-by-missing-var-run-sshd/1110843#1110843

Followed by:

service sshd restart

On a related note, can you please change the update interval to weekly (or even monthly) rather than daily in /etc/cron.d/cron-apt? I changed mine to Sunday:

54 3 * * SUN root test -x /usr/sbin/cron-apt && /usr/sbin/cron-apt

Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:        10
Codename:       buster