Overlay SKScene bug Xcode 9.

I have an important question about a SceneKit project. After updating to Xcode 9, In my SceneKit project i got a big bug after updating.

More specifically, the overlay SKScene file (.sks) does not work anymore. Indeed, after updating to Xcode 9 if i run the game without do any modification to the .sks file, everything works fine BUT if i do some modification (for example if i add a new sprite to the SKScene) and then I run the simulation again, i notice that the .sks file is no more linked to the .swift file (the SKScene subclass). More specifically, just the didMoveTo method is read, but not the frame loop methods as didEvaluateActions and so on.

Did you experiment something similar?