I have a problem that involves MNTP which returns CSV data and ahelper that renders node data. When the DynamicNode is passed into the helper I lose access to the properties and not sure why as I can step into the script and access properties fine before it passed in?

@{
    var panels = Model._SidebarContent.Split(',');

    foreach (var panel in panels)
    {
        var node = Model.NodeById(panel);
        string nodeType = node.NodeTypeAlias;

        switch (nodeType)
        {
            case "ExampleNodeType":
      // Properties accessible via dot notation here e.g. Node.Myproperty
                @ExampleRenderNodeTypeHelper(node) 
                break;
        }
    }
}

@helper ExampleRenderNodeTypeHelper(dynamic contentNode)
{
    // Properties no longer accessible since contentNode is considered an 'object' type now?
        @contentNode.MyProperty
}

I'm using Umbraco 4.11.4 and not experienced this before. The only thing I am doing different to what I normally do is returning CSV data from the MNTP instead of XML.