Audio Source does not output audio when using 3rd party plugin for Text-to-Speech

Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/RS_test.unity” Scene
3. Enter the Play Mode
4. In Game view, press the “Space Bar” key

Expected result: Text-to-Speach can be heard
Actual result: No audio is present

Reproducible with: 2021.3.40f1, 2022.3.27f1, 2022.3.36f1, 6000.0.10f1
Not reproducible with: 2022.3.26f1

Reproducible on:
Play Mode
Windows Standalone Player

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested

Note:

• Project uses 3rd party plugin for TTS