Join Clause with Type losing Type

[belav]

        var joinWitType =
            from c in customers
            join Customers c1 in customers_____________________________
                on c1.GetHashCode() equals c.GetHashCode()
                into e
            select c into d
            select d;
// results in
        var joinWitType =
            from c in customers
            join c1 in customers_____________________________
                on c1.GetHashCode() equals c.GetHashCode()
                into e
            select c into d
            select d;