[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.