Ran into the exact same problem. Did you ever find a solution? 

Hi

The issue is caused because the code above uses contentloader and triggers a content loaded event which ab testing is listening for. This in turn may cause an invalid url to be returned if the content under test is not available for the requested language or there is no test for that language.

Rather than use contentLoader.Get I wrote some code that demonstrates how to get the language urls without triggering AB. Instead it uses the IContentVersionRepository. I suppled two methods, one that gets the url for a specific language given a content reference, and another that gets all the urls for a specific content reference. 

I tested this with an alloy app and it seems to work fine and generated proper Urls for each of the languages I had configured. This code was applied directly to the header.cshtml page in an alloy app for demonstartion purposes and produced the expected Urls.

Hope this helps! 

<div>
	@functions
	{
		/// <summary>
		/// Gets the URL for a specific language and page without triggering AB
		/// </summary>
		/// <param name="languageBranch">the language to get the link for</param>
		/// <param name="link">content reference to the page</param>
		/// <returns></returns>
		public string GetMenuUrl(string languageBranch, ContentReference link)
		{
			var urlString = "NONE"; //  String.Empty; 

			var versionRepository = ServiceLocator.Current.GetInstance<IContentVersionRepository>();
			var publishedVersions = versionRepository.ListPublished(link);

			// Get the published version of the uri for the language specified. Note that it can be null if
			// there are no published versions.
			var contentVersion = publishedVersions.Where(x => x.LanguageBranch == languageBranch).FirstOrDefault();
			if (contentVersion != null)
			{
				urlString = UrlResolver.Current.GetUrl(link, languageBranch, new VirtualPathArguments { ForceCanonical = true });
			}

			return urlString;
		}

		/// <summary>
		/// Gets all the language Url's for the specified content reference
		/// </summary>
		/// <param name="link">content reference to the page</param>
		/// <returns>Tuple containing the language branch and the URL associated with it</returns>
		public IEnumerable<Tuple<string, string>> GetAllAvailableUrls(ContentReference link)
		{
			var urlTuples = new List<Tuple<string, string>>();

			var versionRepository = ServiceLocator.Current.GetInstance<IContentVersionRepository>();
			var publishedVersions = versionRepository.ListPublished(link);

			foreach (var contentVersion in publishedVersions)
			{

				var urlString = UrlResolver.Current.GetUrl(contentVersion.ContentLink, contentVersion.LanguageBranch, new VirtualPathArguments { ForceCanonical = true });

				urlTuples.Add(new Tuple<string, string>(contentVersion.LanguageBranch, urlString));
			}

			return urlTuples;
		}
	}

	<h4>For the current page, we get the URL for each of the specified languages</h4>
	@{
		var url = GetMenuUrl("en", Model.CurrentPage.ContentLink);
		<div><a href="@url" title="@url">en @url</a></div>
		url = GetMenuUrl("sv", Model.CurrentPage.ContentLink);
		<div><a href="@url" title="@url">sv @url</a></div>
		url = GetMenuUrl("de", Model.CurrentPage.ContentLink);
		<div><a href="@url" title="@url">de @url</a></div>
	}
	<br>
	<h4>For the current page, get all the URL's for each available language'</h4>
	@{
		var tuples = GetAllAvailableUrls(Model.CurrentPage.ContentLink);
		foreach (var t in tuples)
		{
			<div><a href="@t.Item2" title="@url">@t.Item1 @t.Item2</a></div>
		}
	}
</div>