CRM 2015: C# WFA Plugin fetchxml result is staying cached

I have created a plugin through visual studio.

Here are the important parts of my code

        protected override void Execute(CodeActivityContext param_executionContext)
        {
            # region tracingService

            this.executionContext = param_executionContext;

            tracingService = executionContext.GetExtension<ITracingService>();
            if (tracingService == null)
            {
                throw new InvalidPluginExecutionException("Failed to retrieve tracing service.");
            }
            tracingService.Trace("Entered VendorActivityCreatesHelpDeskActivity.Execute(), Activity Instance Id: {0}, Workflow Instance Id: {1}",
                executionContext.ActivityInstanceId,
                executionContext.WorkflowInstanceId);

            # endregion

            # region Context

            IWorkflowContext context = executionContext.GetExtension<IWorkflowContext>();

            if (context == null)
            {
                throw new InvalidPluginExecutionException("Failed to retrieve workflow context.");
            }
            tracingService.Trace("VendorActivityCreatesHelpDeskActivity.Execute(), Correlation Id: {0}, Initiating User: {1}",
                context.CorrelationId,
                context.InitiatingUserId);

            IOrganizationServiceFactory serviceFactory = executionContext.GetExtension<IOrganizationServiceFactory>();
            service = serviceFactory.CreateOrganizationService(context.UserId);
   
    // Get HelpDesk Entity
            string fetchXMLString_HelpDesk =
                                    "<fetch mapping='logical'>" +
                                       "<entity name='tsi_helpdesk'>" +
                                          "<attribute name='activityid' />" +
                                          "<attribute name='tsi_customeremailaddress' />" +
                                          "<attribute name='tsi_zendesknumber' />" +
                                          "<attribute name='subject' />" +
                                          "<attribute name='tsi_iscreatedatcrm' />" +
                                          "<attribute name='tsi_source' />" +
                                          "<attribute name='statecode' />" +
                                          "<attribute name='statuscode' />" +
                                          "<attribute name='tsi_lastupdater' />" +
                                           "<attribute name='actualend' />" +
                                          "<filter type='and'>" +
                                             "<condition attribute='activityid' operator='eq' value='" + helpDeskID + "' />" +
                                          "</filter>" +
                                       "</entity>" +
                                    "</fetch>";

            EntityCollection entCollection_HelpDesk = service.RetrieveMultiple(new FetchExpression(fetchXMLString_HelpDesk));

            if (entCollection_HelpDesk.Entities.Count > 0)
            {
                entity_helpdesk = entCollection_HelpDesk.Entities[0];
                if(entity_helpdesk.Attributes.Contains("actualend"))
                {
                    /// EVEN AFTER THERE IS A VALUE FOR ACTUAL END - THE CODE NEVER COMES HERE
     helpDeskActualEndTime = entity_helpdesk["actualend"].ToString();
                }
            }
  
  }

Refer to the part

 /// EVEN AFTER THERE IS A VALUE FOR ACTUAL END - THE CODE NEVER COMES HERE

So, the first time when the helpdesk activity is active the code does not hit. But when I resolve the activity  and I see in the db that there is a value for actualend - the code still does not get hit.

I have a feeling its staying cached -  could some one please help me

protectedoverridevoid Execute(CodeActivityContext param_executionContext)

{

# region tracingService

this.executionContext = param_executionContext;

tracingService = executionContext.GetExtension<ITracingService>();

if (tracingService == null)

{

thrownewInvalidPluginExecutionException("Failed to retrieve tracing service.");

}

tracingService.Trace("Entered VendorActivityCreatesHelpDeskActivity.Execute(), Activity Instance Id: {0}, Workflow Instance Id: {1}",

executionContext.ActivityInstanceId,

executionContext.WorkflowInstanceId);

# endregion

# region Context

IWorkflowContext context = executionContext.GetExtension<IWorkflowContext>();

if (context == null)

{

thrownewInvalidPluginExecutionException("Failed to retrieve workflow context.");

}

tracingService.Trace("VendorActivityCreatesHelpDeskActivity.Execute(), Correlation Id: {0}, Initiating User: {1}",

context.CorrelationId,

context.InitiatingUserId);

IOrganizationServiceFactory serviceFactory = executionContext.GetExtension<IOrganizationServiceFactory>();

service = serviceFactory.CreateOrganizationService(context.UserId);