I found a strange bug on both ios version and mac version. I cannot speak the selection with the new Siri voice. On a mac, with Siri voice selected in system setting, it simply remains silent; on iPad, it will fallback to default Samantha voice. This problem only happened when I upgrade to Catalina and a certain version of iOS (i cannot recall which version it first appeared), but it used to be fine. I have already reset and done a clean reinstall of macOS, but the problem is still there. Hope you can fix this soon! P.S. the same issue is also spotted on Chrome. So this might be a macOS-related bug.