When I use a group by, if I want to use an order by on group items subquery, the order by is ignored. Is this a bug? Should I write my query differently?

new MyEntity(session) { Text = "test 1", Text2 = "2" };
new MyEntity(session) { Text = "test 1", Text2 = "3" };
new MyEntity(session) { Text = "test 1", Text2 = "1" };
new MyEntity(session) { Text = "test 2", Text2 = "2" };
new MyEntity(session) { Text = "test 2", Text2 = "3" };
new MyEntity(session) { Text = "test 2", Text2 = "1" };

Query:

var query = from e in session.Query.All<MyEntity>()
            group e by e.Text into g
            select new { Key = g.Key, First = g.OrderBy(e => e.Text2).Select(e => e.Text2).FirstOrDefault() };

Result :

• test 1, 2
• test 2, 2

I was expecting :

• test 1, 1
• test 2, 1