Cron doesn't run a job at 0 0 * * * but does everything else, what a miracle?

Question

Task Schedulers

There are multiple jobs:
If the job has a time such as every 5 minutes, every minute, every hour, etc. then it runs successfully.
And if the task contains a specific hour or minute, it is not executed!
What is this nonsense?
*/5 * * * * - running (available in /var/log/syslog)
30 0 * * * - not running (missing in /var/log/syslog)
all rules are viewed in crontab -l
what should I do?

Answer 1

the cron file must end with a blank line,
unless otherwise specifically messed up,
see the cron doc
Although cron requires that each entry in a crontab end in a newline
character, neither the crontab command nor the cron daemon will detect
this error. Instead, the crontab will appear to load normally. However,
the command will never run.
So put enter at the end of the line