We have found what should be the source of the issue while checking your ticket:
$ sudo cat /var/log/syslog | grep -i cron
Apr 13 08:26:01 localhost cron: (*system*) RELOAD (/etc/crontab)
Apr 13 08:26:01 localhost cron: (*system*airflow_dags_update) ERROR (Missing newline before EOF, this crontab file will be ignored)
We will work on a fix for this and we will release a new version of the solution.
In the meantime, you can add an empty new line at the end of the
/etc/cron.d/airflow_dags_update file on every VM that you are running. That should solve the issue.
Let us know if that works for you.