I’m experiencing exactly the same issue, returned to using the default Aeon Siren handler since the custom one doesn’t work
If you cannot remove the siren try creating a new device via the IDE and assign it the last network ID of the siren that you remember and then try to exclude it
Edit: Ive modified the default Aeon Siren handler and added the new sounds based on this handler (with an extra beep code sound ive made) and now it works perfectly