publish_post action hook with a scheduled post

From my experience, pusblish_post fires on a scheduled post when the schedule passes, not when you hit the publish button.

I also had issue with my plugin Twitter Goodies.

I figure out that issue by putting 2 different conditions. Please check out here: https://arpitshah.com/publish_post-how-to-check-if-wp-post-is-newly-published-or-edited/

I hope it will help you.