Repeated angularjs directive with external template does not render properly when new array items are added.

The following fiddle renders 3 columns of incrementing numbers representing directives with different templates: one inline, one preloaded, and one from an external template. When you select the "add" button the columns increment. The column representing a directive with an external template seems to create a new array when a the add button pushes a new item to the existing array, and then throw the following error:

TypeError: Cannot call method 'insertBefore' of null

Any ideas what is going on?

http://jsfiddle.net/jwanga/EaRHD/

angular.module('app',[]).controller('controller', function($scope){

    $scope.items = [1,2,3,4,5,6,7,8,9];
    $scope.add = function(){

        $scope.items.push($scope.items[$scope.items.length - 1]+1);

    }

}).directive('item1', function(){
    return{
        restrict:'E',
        replace:true,
        scope: {
            data: '=data'
        },
        template:'<li>{{data}}</li>'
    }
}).directive('item2', function(){
    return{
        restrict:'E',
        replace:true,
        scope: {
            data: '=data'
        },
        templateUrl:'item.html'
    }
}).directive('item3', function(){
    return{
        restrict:'E',
        replace:true,
        scope: {
            data: '=data'
        },
        templateUrl:'https://s3.amazonaws.com/thedigitalself-public/jsfiddle-EaRHD-template.html'
    }
});