Fix bug in NativeEngine.setAlphaMode (#12178)
Fix bug in NativeEngine.setAlphaMode (#12178)


sebavan/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,RaananW/Babylon.js,sebavan/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,sebavan/Babylon.js,BabylonJS/Babylon.js