CRM 2011 - Retrieving FormattedValues from joined entity

Question

I've been converting some of my CRM4.0 plugins to use the CRM2011 SDK. I'm just starting to work with LINQ for Early-Bound entities and have come across a problem.

I am trying to get the formatted value of an OptionSetValue in a joined entity. After looking at this MSDN SDK Query Example, I managed to retrieve the formatted values for the primary entity, but can't seem to translate that to a joined entity.

The code below is a sample of what I'm trying to achieve. I started by using the code from the SDK example.

var query_join8 = (from a in sContext.AccountSet
                    join c in sContext.ContactSet
                        on a.PrimaryContactId.Id equals c.ContactId
                        into gr
                    from c_joined in gr.DefaultIfEmpty()
                    select new
                                {
                                    contact_name = c_joined.FullName,
                                    account_name = a.Name,
                                    account_addresstypecode = a.Address1_AddressTypeCode,
                                    account_addresstypename = a.FormattedValues.ContainsKey("address1_addresstypecode") ? a.FormattedValues["address1_addresstypecode"] : null,
                                    account_formattedValues = a.FormattedValues,
                                    contact_addresstypecode = c_joined.Address1_AddressTypeCode,
                                    contact_addresstypename = c_joined.FormattedValues.ContainsKey("address1_addresstypecode") ? c_joined.FormattedValues["address1_addresstypecode"] : null,
                                    contact_formattedValues = c_joined.FormattedValues,
                                }).ToArray();

The account_formattedValues and account_addresstypename come across corrected and I have access to that data, but for some reason the contact_formattedValues item contains an empty collection, and thus contact_addresstypename is null.

Am I doing this incorrectly, or have I missed something? Has anyone been able or knows how to achieve this? Any help is greatly appreciated.