The animation position is wrong by entity load file(.reality)

I want to create a place virtually object animation for ar app.

such as https://developer.apple.com/documentation/arkit/placing_objects_and_handling_3d_interaction?language=objc

I want to replace the square with animation.

So I create animation by the Reality Composer and export file(.reality).

then I load this file by Xcode.

    var entity: Entity?
    override func viewDidLoad() {
        super.viewDidLoad()
        arView.debugOptions = [.showPhysics]
        arView.session.delegate = self
        let object = try! Entity.load(named: "object_animation")
        self.entity = object
        let anchor = AnchorEntity()


        anchor.addChild(object)
        arView.scene.addAnchor(root)
    }


    func session(_ session: ARSession, didUpdate frame: ARFrame) {
         let bounds = self.arView.bounds
         let screenCenter = CGPoint(x: bounds.midX, y: bounds.midY)
         guard let query = self.arView.makeRaycastQuery(from: screenCenter, allowing: .estimatedPlane, alignment: .horizontal),
             let result = self.arView.session.raycast(query).first
         else {
              self.entity?.isEnabled = false
              return
         }
         self.entity?.isEnabled = true
         self.entity!.transform =  Transform(matrix: result.worldTransform)
     }

then, I build this app, the animation object position is wrong.