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Solves the issue #5.
When the callback fires with SUCCESS, it probably only means the TTS service connected, not that voices/engines are loaded. On slow devices, synthesizer.engines and synthesizer.voices return empty collections even though status == SUCCESS.
Previous code is setting isInitialized = true and immediately trying to access synthesizer.engines, which is empty on slow devices due to the race condition.
This pull request solved the issue on my test device.