Html.BeginForm no longer creating action in OrchardCMS - asp.net-mvc

Question

I have recently rebuild a module DLL for an Orchard CMS project and one of the pages is not longer rendering form actions using BeginFormAntiForgeryPost.
The .cshtml file is:
#using System;
#using Orchard.Mvc.Html;
#{
var eventId = (int) Model.EventId;
string price = (string)Model.Price;
Orchard.ContentManagement.ContentItem contentItem = Model.Item;
string currencies = (string)Model.Currencies;
var pricesArray = price.Split(new Char[]{';'});
var currenciesArray = currencies.Split(new Char[]{';'});
bool allowCurrencyChange = true;
if(pricesArray.Length!=currenciesArray.Length){
allowCurrencyChange = false;
}
price = pricesArray[0];
string currency = currenciesArray[0];
}
<div class="prices-container">
<div class="more-info-link">
<a class="btn" href="#Url.Content("~"+Url.ItemDisplayUrl(contentItem))">
More Information
</a>
</div>
<div class="prices-box">
#if(Convert.ToDecimal(price)>0){
<p class="price">#currency #String.Format("{0:0,0.00}",price) <br /><span style="font-size:13px;">+ VAT</span></p>
}
else{
<p class="price" style="text-indent:-99999px;">#currency #String.Format("{0:0,0.00}",price)</p>
}
#using (Html.BeginFormAntiForgeryPost(Url.Action("Add", "ShoppingCart", new { id = eventId, area = "Events" }))) {
if(Convert.ToDecimal(price)>0){
<input type="hidden" name="currency" value="#currency" />
<input type="hidden" name="price" value="#price" />
if(allowCurrencyChange){
for(int i=0; i<pricesArray.Length;i++){
<input type="hidden" name="#(currenciesArray[i])_price" value="#(pricesArray[i])" />
}
}
<button class="btn btn-success" type="submit">#T("register")</button>
}
else{
<a href="/oforms/Contact-Us" class="btn btn-success" >#T("enquire")</a>
}
}
</div>
</div>
The output before the rebuild was:
<div class="prices-container" shape-id="13">
<div class="more-info-link" shape-id="13">
<a class="btn" href="/identify-the-right-talent" shape-id="13">
More Information
</a>
</div>
<div class="prices-box" shape-id="13">
<p class="price" shape-id="13">GBP 1197.50 <br shape-id="13"><span style="font-size:13px;" shape-id="13">+ VAT</span></p>
<form action="/Events/ShoppingCart/Add/13817" method="post" shape-id="13"> <input type="hidden" name="currency" value="GBP" shape-id="13">
<input type="hidden" name="price" value="1197.50" shape-id="13">
<input type="hidden" name="GBP_price" value="1197.50" shape-id="13">
<button class="btn btn-success" type="submit" shape-id="13">register</button>
<input name="__RequestVerificationToken" type="hidden" value="w10QfGWfU3Y2UNIWRVXtsqUxcSS/OX4GxWCAsdaWDMHV15LqkMpDcqQFYJ1lpbf7ZlNTP5ckVrWFtatRh2poJBTE9NxlXQRua8CNuXgVGtGnSr3lpWpt2KeAwNNhsvmZIiSSSZOuhwbXD08K7+H2fSkrFUAOKVX+eTarLBWdjg8jySGV+Q82oA37NMEBZrQXOWkq4TjEusC5ILqptA1fLZOR8qu0xuPlWrMf4Dli2kw=" shape-id="13">
</form>
</div>
</div>
And after rebuilding the module the FORM ACTION is no longer output:
<div class="prices-container" shape-id="13">
<div class="more-info-link" shape-id="13">
<a class="btn" href="/identify-the-right-talent" shape-id="13">
More Information
</a>
</div>
<div class="prices-box" shape-id="13">
<p class="price" shape-id="13">GBP 1197.50 <br shape-id="13"><span style="font-size:13px;" shape-id="13">+ VAT</span></p>
<form action="" method="post" shape-id="13">
<input type="hidden" name="currency" value="GBP" shape-id="13">
<input type="hidden" name="price" value="1197.50" shape-id="13">
<input type="hidden" name="GBP_price" value="1197.50" shape-id="13">
<button class="btn btn-success" type="submit" shape-id="13">register</button>
<input name="__RequestVerificationToken" type="hidden" value="LcZyoXchQ7IjEJJvxoFQzAYNVOk1ybC7KB/GzXkYdlE5n1zIy6fg3Dod8twQDLxA/cYvBwYfXYDWbNSq81dsq4UTSxevK1vXJxWGAWKOlt0dmt3si5RKYJbIXEplIScSoEBtr5Jaq95YsCe4jpdMe3QroYF5NGj9P8BhPKWbucHJiLyBJULc6ktYuRL0BFQk+oE9AaaYUUv6hyh20T/XTlPjl9uxalvJMTCIiDtSlZQ=" shape-id="13">
</form>
</div>
</div>
Why would the BeginFormAntiForgeryPost and/or Url.Action no longer output the action URL?