Hello @Engineer , I am facing the same issue on 17.5.1 when i use,
SFSpeechRecognizer.supportsOnDeviceRecognition = true
SFSpeechAudioBufferRecognitionRequest.requiresOnDeviceRecognition = true.
Nishchal
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The issue could be related to your Extension minimum deplayment and your host applicaitions minimum deplayment difference.