Graphical effects glitches after changing window visibility

import QtGraphicalEffects 1.15
import QtQuick 2.15
import QtQuick.Controls 2.15
import QtQuick.Window 2.15

Item {
    anchors.fill: parent
    property bool firstVisible: true
    Window {
        visible: firstVisible
        width: 400
        height: 300
        color: "#ff0000"
        MouseArea {
            anchors.fill: parent
            onClicked: {
                firstVisible = !firstVisible
            }
        }
    }
    Window {
        visible: !firstVisible
        width: 400
        height: 400
        color: "#00ff00"
        Popup {
            width: parent.width / 2
            height: parent.height / 2
            parent: Overlay.overlay
            anchors.centerIn: parent
            modal: true
            dim: true
            visible: !firstVisible
            MouseArea {
                anchors.fill: parent
                onClicked: firstVisible = !firstVisible
            }
        }
    }
}

-style Material