`required property` fail only for last object

import QtQuick 2.15
import QtQuick.Controls 2.15
import QtQuick.Window 2.15

Window {
    width: 640
    height: 480
    visible: true
    component AccessibleButton : Button {
        required property string description
        Accessible.description: description
    }
    AccessibleButton {
        //description: "" // Uncomment this line
    }
    AccessibleButton {
        description: "" // Comment this line
    }
}