first comment line in crontab always gets removed

[Siju George <sgeorge.ml@xxxxxxxxx>]

Hi,

I commented out my first line in crontab and saved it.
When I took 'crontab -e' I found that it was removed.
I tested it again. same behavior

The first line ony gets removed if it starts with a #
Is this accepted behavior?

Thanks

--Siju