While attempting to comment a reply posted by a Zoho help agent on the following post, I received an error saying "comments cannot be blank" and my comment was definitely not blank. Here's the original post: https://help.zoho.com/portal/en/community/topic/new-calendar-update-causes-duplicate-invitations-and-reminders-to-be-sent-out-when-syncing-with-google-calendar

I had to add my comment as a reply to the original poster when, in fact, I was not replying to that person. (TWO screenshots attached to help you see what happened.)