I've just updated to macOS 10.15.4 and every time I check if on-device speech recognition is available I get back false. This was working on 10.15.3.
speechRecognizer?.supportsOnDeviceRecognition = true
print("supportsOnDeviceRecognition: \(String(describing: speechRecognizer?.supportsOnDeviceRecognition))")
Anybody else seeing this? Are there any tricks to get this working again?