QAudioInput / QAudioOutput: Sample rate 22050 on Mac doesn't work any more

With Qt 4.8.1, it was possible to record / play sounds using QAudioInput / QAudioOutput using sample rate 22050.
With Qt 5.2.0, on the same environment (Mac OS X 10.7.4), it doesn't work any more.

Using Qt 4.8.1, the list returned by QAudioDeviceInfo::supportedSampleRates() (on standard Input/Output devices) contains 22050, using Qt 5.2.0 it doesn't.

I looked in the source code and compared code of QAudioDeviceInfoInternal::frequencyList() (qaudiodeviceinfo_mac_p.cpp, Qt 4.8.1) with CoreAudioDeviceInfo::supportedSampleRates() (coreaudiodeviceinfo.mm, Qt 5.2.0). These functions seem to be similar, but in QAudioDeviceInfoInternal::frequencyList() there are the lines

// Add some common frequencies
rc << 8000 << 11025 << 22050 << 44100;

which are absent in CoreAudioDeviceInfo::supportedSampleRates().

Obvious, these lines were important?

Please please fix it, sample rate 22050 is ESSENTIAL in my application!
Many thanks, Christian

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Similar problem with channel count, see comment below.