Code completion does not work for templates with arguments with default value

struct Foo
{
    int bar;
};
template <typename T = Foo>
struct TemplateStruct
{
    T t;
};

{
TemplateStruct<> templateStruct;
templateStruct.t. //code completion does not work
}
{
TemplateStruct<Foo> templateStruct;
templateStruct.t. //code completion works
}