Changes to AU parameter / event listeners in Big Sur?

[Ian Kerr via Coreaudio-api]

Greetings,

In Big Sur (11.0.1), building with Xcode 12.2 and the MacOSX11.0 SDK, it
seems like my AUv2 plugins never receive parameter change notifications. I
have tried using AUListenerCreate, AUEventListenerCreate, and
AUListenerCreateWithDispatchQueue
to no avail. For example, here is one such setup: OSStatus result =
AUListenerCreate(
      &AuPlugin<T>::OnParameterChanged,
      this,
      CFRunLoopGetMain(),
      kCFRunLoopDefaultMode,
      0.05,
      &m_parameterListener);

and then for each parameter:

AudioUnitParameter parameter;
parameter.mAudioUnit = GetComponentInstance();
parameter.mElement = 0;
parameter.mParameterID = iParameter;
parameter.mScope = kAudioUnitScope_Global;

OSStatus result = AUListenerAddParameter(m_parameterListener, this,
&parameter);

Testing this in Logic 10.6.0, REAPER 6.40.0, and Studio One 5.0.2, the
OnParameterChanged callback does not seem to be called.

However, if I test the same Audio Unit in High Sierra (10.13.6), the
callback *is* called.

Did something change in Big Sur that would prevent the callback from being
called? Is there something additional that I need to do?

Thanks,
--Ian

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