Unexpected results using Interface Builder for extension

[phroggyy]

So today I got around to implementing the shy navbar in our upcoming iOS app, and it's working great until I add an extension view. I'm using a UIView with a table view embedded in that. Inside that table view, I've placed my extension view inside the table view on the top, with a prototype cell right under that. See the following screenshot from IB:

However, this produces an unexpected result in the app where the labels disappear:

Is this a known issue, and somehow related to #41 or am I just doing something wrong?

The same thing happens regardless of if I use constraints or not.