All our custom Playground Books using SpriteKit stopped working after upgrading to SwiftPlaygrounds version 4.4
To reproduce the issue, simply create a new book by clicking the top right hand icon and in the book add two lines of code.
import SpriteKit
let circle = SKShapeNode(circleOfRadius: 100.0)
The second line produces an error. I tried with other classes. SKAction seems to work. SKSpriteNode, SKTexture etc have the same issue. Please help. Our students are stuck!