Error while using `SSERequestID` with `ServerSentEvents`

[maxott]

I have been following the example in the tutorial https://goa.design/docs/3-tutorials/4-streaming/8-sse/

Method("stream", func() {
    Description("Stream events using Server-Sent Events")
    Payload(func() {
        Attribute("startID", String, "ID of the last event received", func() {
            Description("Used to resume streaming from a specific event")
            Example("123")
        })
    })
    StreamingResult(Event)
    HTTP(func() {
        GET("/events/stream")
        ServerSentEvents(func() {
            SSERequestID("startID") // Maps the Last-Event-Id header to startID
        })
    })
})
...
var Event = Type("Event", func() {
	Description("Cloud event created by job")
	Attribute("id", String, "Event ID")
	// Attribute("type", String, "Type of event")
	// Required("id", "type")
})

Getting the following error:

template: server-handler-init:68:20: executing "server-handler-init" at <.Method.Payload.Type.Name>: can't evaluate field Type in type string

It works fine if I remove SSERequestID("startID")

goa version:

goa version
Goa version v3.21.5

Any suggestions on what I have been missing here?

[maxott]

Same error shows also up for the example in the tests which makes me think that I may have an issue in my context:

	Method("SSERequestIDMethod", func() {
		Payload(func() {
			Attribute("id", String)
		})
		StreamingResult(String)
		HTTP(func() {
			GET("/request-id")
			ServerSentEvents(func() {
				SSERequestID("id")
			})
		})
	})

var _ = Service("service", func() {

	HTTP(func() {
		Path("/1/services")
	})

        ...