HarmonyOS 鸿蒙Next 当应用切到后台时应用动画被打断

请求大佬解答，为何另一个动画会打断，这里的web动画正常执行：

Web({
  src: $rawfile('rpl_in_plan_back_left.html'),
  controller: this.controller
})
  .height('57%')
  .width('80%')
  .zIndex(3)
  .backgroundColor(Color.Transparent)
  .onAppear(() => {
    this.webControllerAttached()
  })
  .alignRules({
    bottom: { anchor: '__container__', align: VerticalAlign.Bottom },
    end: { anchor: '__container__', align: HorizontalAlign.End },
    start: { anchor: '__container__', align: HorizontalAlign.Start },
    top: { anchor: '__container__', align: VerticalAlign.Top },
    bias: { vertical: 0.712, horizontal: 0.493 }
  })
如上是xml动画转的web动画，下面动画会被打断：
private webControllerAttached() {
  if (!(this.animationStart)) {
    this.animationStart = true
    this.startAnimation()
  }
}

/*

• アニメーション開始 */

private startAnimation() {
 if (!(this.parentViewModel.openDialogCheck())) {
   //アニメーションの決定
   let it = this.parentViewModel.btReceivedPlnParkInInfo.value
   if (it) {
     this.viewModel.useAnimation(it.moveDirection)
     this.viewModel.animationDirect(it.recommendDirection)
   }

   // TODO viewModel.animationSet.cancel()
   // アニメーションの開始
   setTimeout(() => {
     this.getUIContext()
       .keyframeAnimateTo({ iterations: CarAnimatorConst.MAX_NUM },
         this.genKeyframe(this.viewModel.animation!))
   })
 }
}
genKeyframe(data: Array<CarAnimator.KeyFrame>): Array<KeyframeState> {
 return data.map<KeyframeState>((values) => ({
   duration: this.currentKeyTime(data, values) * 1000,
   event: () => {
     this.trX = this.viewModel.animationDir.first * this.dpToPercentWidth(values.position.x)
     this.trY = this.viewModel.animationDir.second * this.dpToPercentHeight(values.position.y)
     this.rot = this.viewModel.animationDir.third * values.degreeRotationAngle
   },
   curve: Curve.Linear
 } as KeyframeState))
}

currentKeyTime(data: Array<CarAnimator.KeyFrame>, current: CarAnimator.KeyFrame): number {
 let time = current.keyTime
 if (data.indexOf(current) == 0) {
   return time
 }
 let beforeTime = data[data.indexOf(current) - 1].keyTime
 return time - beforeTime
}

dpToPercentWidth(dp: number) {
 return dp * CarAnimatorConst.STANDARD_DENSITY * this.percentWidthFactor;
}

dpToPercentHeight(dp: number) {
 return dp * CarAnimatorConst.STANDARD_DENSITY * this.percentHeightFactor;
}

why？？？