og:description not working

WordPress version: 3.5.1
WordPress SEO version: 1.4.7

I did this:
1. login to wordpress admin
2. go to “SEO” -> ‘Social’
3. select “add open graph meta”
4. Fill in the frontpage image
5. Fill in description
6. click Save

I expected the plugin to do this:
Include the og:description meta tag in the header with all the other og:* meta tags

Instead it did this:
Did not include the og:description meta tag… I had to add it manually

http://wordpress.org/extend/plugins/wordpress-seo/