QQC2 TabBar first TabButton visual state incorrect when deselected

import QtQuick
import QtQuick.Controls

Window
{
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    TabBar
    {
        anchors.topMargin: 5
        anchors.top: parent.top
        anchors.left: parent.left
        anchors.right: parent.right

        TabButton { text: "Button1" }
        TabButton { text: "Button2" }
        TabButton { text: "Button3" }
        TabButton { text: "Button4" }
    }
}