[CustomPress] Bug: Custom post type with editor custom field throws invalid error on publish

Safari OS X

Steps to reproduce:

1. Add new custom post WITH required editor type custom field

2. Write some content into the editor

3. Publish

Expected result: Publish request submits and saves new custom post

Actual result: Throws error "This field is required." even if editor has content in it. Pressing publish again works to publish the article.