Scheduled post tagged notifications sent on post creation

Summary

Users tagged in a scheduled post are notified when the post is created instead of when the post is released.

Steps to reproduce

Create a scheduled post with a user tagged in it. The user who is tagged will receive a notification right away instead of when the post is published.

Platform information

Web Browser

What is the current bug behavior?

A user tagged in a scheduled post is notified right away.

What is the expected correct behavior?

A user tagged in a scheduled post should be notified when the post publishes at the scheduled time.