Fix race condition in playTone (#3126)

Author: xuesichao

CHANGELOG.md

@@ -26,6 +26,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Fix occasional issue with setting encoded transform on video receive streams that would lead to missing video.
+- Fix a race condition in DefaultMeetingReadinessChecker `playTone` and `stopTone` method.
 
 ## [3.29.0] - 2025-06-24