XMLPackages postprocessing not working

Question

At the bottom of script.bodyclose.xml.config we have:

 

	</PackageTransform>
  <PostProcessing>
    <queryafter>
      <sql>
            UPDATE Customer SET ExtensionData=@agent WHERE CustomerID=@CustID AND @CustID > 0;
      </sql>
      <queryparam paramname="@CustID" paramtype="xpath" requestparamname="/root/System/CustomerID" sqlDataType="int" defvalue="0" validationpattern="" />
      <queryparam paramname="@agent" paramtype="xpath" requestparamname="/root/ServerVariables/HTTP_USER_AGENT" sqlDataType="varchar" defvalue="" validationpattern="" />
    </queryafter>
  </PostProcessing>
</package>

This worked in v9.5, but in v10 we get 

ExecuteNonQuery: CommandText property has not been initialized

And the problem seems to be in core >xmlpackages.cs line 1214 where "var sql = node.sql as string;" returns null rather than the actual sql from the package.

Does this work correctly for anyone else?