Ion-infinite-scroll loadingSpinner not showing on device

ion-infinite-scroll loadingSpinner not showing on device, but it’s works well in browser. is it bug or else?

<ion-infinite-scroll (ionInfinite)="doInfinite($event)">
      <ion-infinite-scroll-content 
      loadingSpinner="bubbles"
      loadingText="Loading more products..." >
      </ion-infinite-scroll-content>
</ion-infinite-scroll>