Failed attempt #2 at Entity/move with a callback

Entity+Move2.swift

import Foundation
import RealityKit
import Combine

private var playbackCompletedSubscriptions: Set<AnyCancellable> = .init()

extension Entity {
    
    /// Animated `Entity/move` with a completion handler.
    ///
    /// This implementation works but for some reason `timingFunction` appears to be
    /// ignored and the timing function of the resulting animation is always linear.
    func move1(to target: Transform, relativeTo referenceEntity: Entity?, duration: TimeInterval, delay: TimeInterval = 0, timingFunction: AnimationTimingFunction = .default, completion: @escaping () -> Void) {
        guard scene != nil else {
            completion()
            return
        }
        
        let animation = FromToByAnimation(name: "Entity/move", to: target, duration: duration, timing: timingFunction, isAdditive: false, bindTarget: .transform, delay: delay)
        
        do {
            let animationResource: AnimationResource = try .generate(with: animation)
            let animationPlaybackController = playAnimation(animationResource)
            
            scene?.publisher(for: AnimationEvents.PlaybackCompleted.self)
                .filter { $0.playbackController == animationPlaybackController }
                .sink(receiveValue: { event in
                    completion()
                }).store(in: &playbackCompletedSubscriptions)
        } catch {
            assertionFailure("Could not generate animation: \(error.localizedDescription)")
        }
    
    }
    
}