During November 2024, Chaopeng focused on stabilizing Vsync initialization within the Flutter engine for the Fuchsia platform. Working in C++ and leveraging expertise in system programming and multithreading, Chaopeng introduced a one-time guard, MaybeRunInitialVsyncCallback, in the flutter/engine repository to prevent redundant Vsync callbacks when the display is off. This approach used an internal flag to ensure the callback executed only once, addressing edge-case instability and reducing unnecessary processing. The fix was also propagated through engine-flutter-autoroll/flutter, ensuring consistent behavior across engine updates. This work improved startup reliability and runtime stability for Flutter applications running on Fuchsia devices.