"unstable" Swift UI Animation in Xcode 11 b1

CircleLine.swift

//
//  ContentView.swift
//  CircleLine
//
//  Created by Adam Bell on 6/5/19.
//  Copyright © 2019 Adam Bell. All rights reserved.
//

import SwiftUI

struct ContentView : View {

  @GestureState var dragTranslation: CGSize = .zero
  @GestureState var translations: [CGSize] = Array<CGSize>(repeating: .zero, count: 10)

  var body: some View {
    let dragGesture = DragGesture(minimumDistance: 0)
      .updating($translations) { (dragGesture, translations, transaction) in
        translations.insert(dragGesture.translation, at: 0)
        translations.removeLast()
      }

    return ZStack {
      ForEach((0..<translations.count).reversed()) { index in
        return Circle()
          .frame(width: 50, height: 50, alignment: .center)
          .foregroundColor(.blue)
          .offset(x: self.translations.count > 0 ? self.translations[index].width : 0, y: self.translations.count > 0 ? self.translations[index].height : 0)
          .gesture(index == 0 ? dragGesture : nil)
          .animation(index != 0 ? Animation.fluidSpring().delay(0.1 * Double(index)) : nil)
      }
    }
  }
}

#if DEBUG
struct ContentView_Previews : PreviewProvider {

  static var previews: some View {
    return ContentView()
  }
}
#endif