anacron might be disabled if 2.3-33 was ever installed
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If you run Debian testing/unstable and ever installed anacron 2.3-33 on
a systemd based system, then anacron will no longer be enabled and the
daily/weekly/monthly cron jobs will not be run until it is.
Since not all cron jobs have migrated to systemd timers, Debian
testing/unstable systems with systemd and anacron may be missing
some essential cron jobs, such as making backups of aptitude state.
To see if a system is affected you can use these commands:
zgrep -i anacron.*2.3-33 /var/log/apt/history.log*
systemctl status anacron.service anacron.timer
To re-enable anacron you can use these commands:
sudo systemctl enable anacron.service anacron.timer
sudo systemctl start anacron.service anacron.timer