Fastblur/RecursiveBlur not working on 6.8 (ios)

i have an issue , 

   Image{
        width: parent.width
        height: parent.height
        source:  "redroom.jpg"
        fillMode: Image.PreserveAspectCrop
        layer.enabled: true
        layer.effect: FastBlur{             radius: 8         }

      }

above QML is working on android , but running it on ios returns an error 

Missing QML.Element class info for QGfxSourceProxy

qrc:/qt-project.org/imports/Qt5Compat/GraphicalEffects/FastBlur.qml:121 SourceProxy is not a type

i already added QT+=core5compat on my .pro

so i have no clues what is the issue here now 

Below is the system information 

MacOS silicon (macbook air m1 ) 

Sequouia 15.2 

Qt 6.8.0 for iOS 

Update: 

 i tried to downgrade to 6.6.3 , and its working so the concern is really on 6.8