Qt Quick Extras - Flat example UI stuck

Qt Quick Extras - Flat example UI stuck on Mac OS 12, Windows 10, Ubuntu 20.04, Android 11 (Oneplus 7 pro) and iOS 15.

Steps to reproduce:

1. Build the example for any of the above said platforms

The Application keeps loading and the UI is stuck on the first screen. 

Logs: 

qrc:/Content.qml:370:32: Type Flat.CircularGaugeStyle unavailable
qrc:/ExtrasImports/QtQuick/Controls/Styles/Flat/CircularGaugeStyle.qml:82:22: Duplicate method name: invalid override of property change signal or superclass signal
14:45:26: /Users/anurupjalota/Qt/Examples/Qt-5.15.13/quickcontrols/extras/build-flat-Desktop_Qt_5_15_13_for_macOS_Universal-Debug/flat.app/Contents/MacOS/flat exited with code 0