What I Expected To Happen

Edit page created earlier via Page Builder.

What Happened Instead

After Preview Changes or Update, edited page once have and next time don't have content.

Steps to Reproduce the Bug

1. Add New Page
2. Enable Page Builder
3. Add Row, Column/Columns and Content
4. Click Publish
5. Go to All Pages
6. Edit New Page
7. Click Preview Changes -> Empty page
8. Disable New tab with empty page
9. Go to All Pages without updating post
10. Again Edit New Page -> Empty page builder

Note: I tested it on local osx machine with MAMP, WP4.7, No other plugins active.