the visual focus indicator of Button in FluentWinUI3 style doesn't work well with FocusScope

Update: seems to be a problem with FocusScope in general. See the comment below.

import QtQuick
import QtQuick.Window
import QtQuick.Controls.FluentWinUI3

ApplicationWindow {
    width: 640
    height: 480
    visible: true

    ListModel {
        id: mymodel
        ListElement {
            name: "1"
        }
        ListElement {
            name: "2"
        }
        ListElement {
            name: "3"
        }
    }
    component MyButton: Button {
        required property string name
        text: name
        onFocusChanged: {
            console.log(name + focus)
        }
        onClicked: {
            console.log(name + " clicked")
        }
        focusPolicy: Qt.StrongFocus
    }

    GridView {
        id: grid
        anchors.fill: parent
        focus: true
        model: mymodel
        keyNavigationEnabled: true
        delegate: MyButton {}
        highlight: Rectangle {
            id: highlighter
            color: "lightgray"
        }
    }
}

First try to change focus to the third button using Tab key, then use arrow keys to change focus, you can see that the focus is overridden by the GridView's own keyboard navigation handling. However, the Button's focus indicator (line border) doesn't disappear. The same happens when you use a mouse to click on a button. This doesn't follow WinUI 2/3 behavior with elements' focus indicator.

Material style doesn't have this issue: the visual highlight drew by the Button fades away when either the focus changes, or when mouse clicks on a button. However, it does seem to share a problem with FluentWinUI3 which is the inability to reuse the Control style's focus indicator for ListView/GridView selection highlight: I would like to have ListView/GridView trigger whatever the Control style has for the Button's focus visual highlight, instead of having to draw my own.