Failed attempt #1 at Entity/move with a callback

Entity+Move1.swift

import Foundation
import RealityKit
import Combine

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

extension Entity {

    /// Animated `Entity/move` with a completion handler.
    ///
    /// This implementation doesn't work. The animation doesn't happen,
    /// although `completion` is called after `duration` seconds.
    func move2(to target: Transform, relativeTo referenceEntity: Entity?, duration: TimeInterval, delay: TimeInterval = 0, timingFunction: AnimationTimingFunction = .default, completion: @escaping () -> Void) {
        guard scene != nil else {
            completion()
            return
        }

        let animationPlaybackController = move(to: transform, relativeTo: referenceEntity, duration: duration, timingFunction: timingFunction)
        
        scene?.publisher(for: AnimationEvents.PlaybackCompleted.self)
            .filter { $0.playbackController == animationPlaybackController }
            .sink(receiveValue: { event in
                completion()
            }).store(in: &playbackCompletedSubscriptions)
    }

}