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Definitely a bug in either Qt or the underlying audio driver. It's pretty ridiculous for a audio driver to refuse to output audio until its buffer is full. What if the user is playing short, intermittent audio sounds? I will note it works fine on all the Linux, Windows and macOS systems I have. If you can reproduce it easily I suggest writing a small PySide based script to reproduce it (just create an audio device with a large buffer and write some random raw audio data into it) and open a bug report at Qt with your reproducer script.
And in the next release there will be a tool to generate Piper based audio overlays which means you can pre-create the TTS audio files and play then directly using the calibre viewer to workaround the Qt bug.
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