SiriKit CustomResponse doesn't output text

Hi,


I have created a custom Intent via the new iOS 12 .intentdefinition file. I have set a custom response for the success code:


https://www.dropbox.com/s/7ofu54co97lhmur/Screenshot%202018-07-25%20at%2014.46.43.png?dl=0


I have also implemented a custom IntentHandler which should response the created response.



https://www.dropbox.com/s/6bppa0afyli2yo8/Screenshot%202018-07-25%20at%2014.48.37.png?dl=0


As you can see I have set a breakpoint and my extension also stops at this point, but Siri only responses with the following text:


"Appname says"


Nothing else. Should this already work with iOS 12 Beta 4?


Does anyone know what I did wrong?