OpacityMask does not work with source item rotation animation

import QtQuick 2.12
import QtGraphicalEffects 1.12

Item {
    width: 300
    height: 300

    Image {
        id: bug
        source: "images/bug.jpg"
        sourceSize: Qt.size(parent.width, parent.height)
        smooth: true
        visible: false
    }

    Image {
        id: mask
        source: "images/butterfly.png"
        sourceSize: Qt.size(parent.width, parent.height)
        smooth: true
        visible: false
    }

    OpacityMask {
        anchors.fill: bug
        source: bug
        maskSource: mask
    }
}

    Image {
        id: bug
        source: "images/bug.jpg"
        sourceSize: Qt.size(parent.width, parent.height)
        smooth: true
        visible: false
        RotationAnimator on rotation {
            from: 0;
            to: 360;
            duration: 5000
        }
    }