Lottie animation disappearing from iOS listview on item source sorting

## 🐛 Bug Report

Lottie animation disappearing from iOS listview on item source sorting

### Expected behavior
It should be working fine in all cases whatever the operation need to perform on item source binded with the list view in previous version it was working.

### Reproduction steps
Create a list view and add animation in view cell bind this list view with some item source and then try to sort the item source the animation will disappear on xamarin iOS app

### Configuration

**Version:** 4.1.0

**Platform:**
- [📱] :iphone: iOS

- [🐒 ] :monkey: Xamarin.Forms

No file or test is named. First reproduce the problem in a Xamarin.Forms iOS app using a ListView with a Lottie animation and a sorted item source on version 4.1.0; done means the animation remains visible after sorting, as it did in the previous version.

Written by the indexing model from the issue text.