UIViews with embedded scroll views (UITableView, UICollectionView) are ambiguous with Auto Layout in Xcode 6 b2. Bug or reason?

Question

Here's an example project: http://cl.ly/1d0B1H0s0J0z

If I put a UIView in a UIViewController and pin it to its edges, it works fine. Same with a UIImageView, however if I use one a UITableView or a UICollectionView I get warnings that the view has "ambiguous scrollable content height/width". The same constraints work fine under Xcode 6 beta 1, but in this new beta 2 seed, it won't.

Is this a change to how views with embedded scroll views are handled? Or is it a bug?

Answer 1

Some info on Apple developer forums: https://devforums.apple.com/message/987563#987563

I'm pretty sure this is a bug.