JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app="myApp" ng-controller="MyCtrl">
    It works without "track by"
    <ul>
        <li ng-repeat="item in items|orderBy:'toString()'">{{item}}</li>
    </ul>
    It doesn't work witho "track by"
    <ul>
        <li ng-repeat="item in items track by $index|orderBy:'toString()'">{{item}}</li>
    </ul>
</div>

JavaScript

var myApp = angular.module('myApp',[]);

function MyCtrl($scope) {
    $scope.items = ['item 2', 'item 1'];
}