Following the example in the documentation for the Media Picker, I have this code trying to retrieve and display multiple images uploaded to the page through the new Media Picker:

    @if (Model.Content.HasValue("slideshowImages"))
    {
        var imagesList = Model.Content.GetPropertyValue<string>("slideshowImages").Split(new string[] { "," }, StringSplitOptions.RemoveEmptyEntries).Select(int.Parse);
        var imagesCollection = Umbraco.TypedMedia(imagesList).Where(x => x != null);
        foreach (var imageItem in imagesCollection)
        {
            <div class="abnner_slider_img" style="background-image: url('@imageItem.Url');"> </div>
        }
    }

On the foreach line, it throws an "Input string was not in a correct format" error.

If also throws the same error if I try to get a count of the images by doing either imagesList.Count() or imagesCollection.Count()

Has something changed for 7.6 that breaks this?