I updated my iPhone to 13.1.1 and Siri now works as before (iOS 12). However the Sena Utility app still requires a firmware update to communicate with the bluetooth unit.
I tested my 10S & 30K the last 2 days with the 13.1.1 update & they both work now with Siri. I have an iPhoneX. However the phone app still won't work till a firmware update is released.