Again Verify data event wizard

è Select “Transfer Data”

è Source should be “XML field in Infopath”

è Destinations should be “Data Field”

 if it does not work, then you can try below code in server code event

           String xml = String.Empty;

            XmlDocument doc = null;

            try

            {

                //Get the XML Field string

                xml = K2.ProcessInstance.XmlFieldsr"FormName"].Value.ToString();

                //Load up the XML

                doc = new XmlDocument();

                doc.LoadXml(xml);

                //Create a name space manager for InfoPath

                XmlNamespaceManager nsMgr = new XmlNamespaceManager(doc.NameTable);

                nsMgr.AddNamespace("my", doc.DocumentElement.GetNamespaceOfPrefix("my"));

//Assign your data field here

                K2.ProcessInstance.DataFieldn"DataField Name"].Value = doc.SelectSingleNode("XPATH OF XML Field", nsMgr).InnerText;

            }

            catch (Exception exception)

            {

                throw exception;

            }

            finally

            {

                xml = null;

                doc = null;

            }

I was able to resolve the issue by managing the data connections in the InfoPath Form, I opened the connection and modified the Submit Workflow Service data connection, once I went through all the steps to modify it I saved the form and redeployed my workflow and form and it now saves the newly added fields.