CreateWmiEventSink returns empty *cim.WmiInstances onObjectReady

Trying to create a consumer for Events in the Security log as follows:

ctx := context.TODO()

	sessionManager := wmi.NewWmiSessionManager()
	defer sessionManager.Dispose()

	session, err := sessionManager.GetLocalSession("ROOT\\CimV2")

	if err != nil {
		log.Printf("sessionManager.GetSession failed with error %v", err)
		return
	}

	connected, err := session.Connect()

	if !connected || err != nil {
		log.Printf("session.Connect failed with error %v", err)
		return
	}
	defer session.Close()
	log.Print("Creating WMI Sink")
	eventSink, err := wmi.CreateWmiEventSink(session, &ctx, onObjectReady, onCompleted, onProgress, onObjectPut)
	if err != nil {
		log.Printf("CreateWmiEventSink failed with error '%v'", err)
		return
	}
	defer eventSink.Close()

	_, err = eventSink.Connect()
	if err != nil {
		log.Printf("Connect failed with error '%v'", err)
		return
	}
	log.Print("Subscribing to query")
	_, err = session.ExecNotificationQueryAsync(eventSink, "SELECT * FROM __InstanceCreationEvent WITHIN 100 WHERE TargetInstance ISA 'Win32_NTLogEvent' AND TargetInstance.EventCode = '4742'")
	if err != nil {
		log.Printf("CallMethod failed with error '%v'", err)
		return
	}
	log.Printf("Starting Main Loop")
	for {

		time.Sleep(1 * time.Second)

		for eventSink.PeekAndDispatchMessages() {

		}
	}

wmInstances on the function arrives with an empty interface. The expected result would be a WMIInstance where I could retrieve the property TargetInstance

func onObjectReady(context interface{}, wmiInstances []*cim.WmiInstance) {
	log.Print("ObjectReady")
	fmt.Printf("context: %v\n", context)
	target := wmiInstances[0]
}

Start with CreateWmiEventSink, its onObjectReady callback, and the ExecNotificationQueryAsync path shown in the report. Reproduce the Win32_NTLogEvent query and inspect how the callback receives wmiInstances; done means onObjectReady receives a populated WmiInstance whose TargetInstance property can be retrieved.