Executing queries with ExecuteWithResults using the BatchSeparator

Question

We are using Smo.Server to run some SQL batches.
For queries that create stored procedures or tables and contain the separator GO the following code works:

server.ConnectionContext.ExecuteNonQuery(sql);

But the following fails

server.ConnectionContext.ExecuteWithResults(sql);

For sql that doesn't change the database structure it seems that using GO works fine on both.
I can see that ExecuteWithResults supports DDL, because it runs successfully CREATE TABLE.
But it doesn't support

CREATE TABLE ...
GO
SELECT 1

This last query works with no problems if I use ExecuteNonQuery
What do I need to do to be able to run this last query and access to the result DataSet?