Pro Form, Create New Post, Post Thumbnail bug in 3.0.0 above

Hi,

I found a bug in Post Thumbnail bug in 3.0.0 and above.

I have a Pro Form that Create New Post with - Title, Content, Featured Image. Everything works except the Post Featured Image in v3.0.0 and above. But it has been working fine in v2.2.7.

I am use Mac and staging site on Local.

Brian