Initialization of class hierarchy now fails in Swift 1.2 - swift

Question

Assuming the following class structure:
class A : SKSpriteNode
{
let foo : CGFloat
required init?(coder aDecoder: NSCoder) { ... }
init(foo: CGFloat)
{
self.foo = foo
super.init(
texture: SKTexture(imageNamed: "test"),
color: UIColor.blackColor(),
size: CGSizeMake(42, 42))
}
}
class B : A
{
required init?(coder aDecoder: NSCoder) { ... }
init()
{
super.init(foo: 42)
}
}
With A and B being in different modules, shows the following compiler error in B:
Initializer 'init()' overrides Objective-C method 'init' from superclass 'SKSpriteNode'
However, when changing init() in B to override init(), the following error occurs:
Initializer does not override a designated initializer from its superclass
Which is only solvable by adding init() in A which in turn calls the init of the base class.
Observations:
The above code did work in Swift 1.1 (i.e. without override).
It does work, when A and B are in the same module.
It does work, when overriding init() in A and using override init() in B.
The release notes state:
Imported C structs now have a default initializer in Swift, which initializes all of the struct's fields to zero.
But IMO this is not related, since SKSpriteNode is not a struct.
Is this a compiler bug or did I miss something else in the release notes?
Update Apple fixed this in Xcode 6.3 Beta 2.