Message "AVAudioSessionPortImpl.mm:56:ValidateRequiredFields: Unknown selected data source for Port Speaker (type: Speaker)"

iOS 12 I am seeing these on startup of my synthesizer apps which all use the same startup code, modified slightly from "UsingAVAudioEngineforPlaybackMixingandRecordingAVAEMixerSample" - anyone have a best practices version of this example now that it is no logner being maintained, or does anyone otherwise have an indication of how to get rid of the message?

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I'm seeing the same problem in my games. It looks like others are running into it, too, based on a Google Search or two. So far I don't see any explanations or solutions offered though.