Can SceneKit be used with Swift 6 Concurrency ?

I am trying to port SceneKit projects to Swift 6, and I just can't figure out how that's possible. I even start thinking SceneKit and Swift 6 concurrency just don't match together, and SceneKit projects should - hopefully for the time being only - stick to Swift 5.

The SCNSceneRendererDelegate methods are called in the SceneKit Thread.

If the delegate is a ViewController:

class GameViewController: UIViewController {
    let aNode = SCNNode()

    func renderer(_ renderer: any SCNSceneRenderer, updateAtTime time: TimeInterval) {
        aNode.position.x = 10
    }
}

Then the compiler generates the error "Main actor-isolated instance method 'renderer(_:updateAtTime:)' cannot be used to satisfy nonisolated protocol requirement"

Which is fully understandable.

The compiler even tells you those methods can't be used for protocol conformance, unless:

• Conformance is declare as @preconcurrency SCNSceneRendererDelegate like this:

class GameViewController: UIViewController, @preconcurrency SCNSceneRendererDelegate {

But that just delays the check to runtime, and therefore, crash in the SceneKit Thread happens at runtime...

Again, fully understandable.

• or the delegate method is declared nonisolated like this:

    nonisolated func renderer(_ renderer: any SCNSceneRenderer, updateAtTime time: TimeInterval) {
        aNode.position.x = 10
    }

Which generates the compiler error: "Main actor-isolated property 'position' can not be mutated from a nonisolated context".

Again fully understandable.

If the delegate is not a ViewController but a nonisolated class, we also have the problem that SCNNode can't be used.

Nearly 100% of the SCNSceneRendererDelegate I've seen do use SCNNode or similar MainActor bound types, because they are meant for that.

So, where am I wrong ? What is the solution to use SceneKit SCNSceneRendererDelegate methods with full Swift 6 compilation ? Is that even possible for now ?