DropShadow renders differntly in 6.4.x

// Qt 5
//import QtQuick 2.15
//import QtQuick.Window 2.15
//import QtGraphicalEffects 1.15

// Qt 6
import QtQuick
import QtQuick.Window
import Qt5Compat.GraphicalEffects

Window {
    width: 640
    height: 480
    visible: true
    title: 'Shadow'

    Rectangle {
        id: card
        width: 100
        height: 100
        anchors.centerIn: parent
        color: '#F5F5F5'
        radius: 12
    }

    Item {
        anchors.fill: card

        DropShadow {
            id: layer3
            source: card
            radius: 32
            verticalOffset: 20
            color: Qt.rgba(102 / 255, 102 / 255, 102 / 255, 0.32)
            transparentBorder: true
            anchors.fill: parent
            spread: 0
        }
    }
}