[REG 6.5.3-6.7.3] Strange Qt warnings in Debug build

QMetaObject::indexOfSignal: signal xChanged(int) from QQuickWindow redefined in QQuickWindowQmlImpl
QMetaObject::indexOfSignal: signal yChanged(int) from QQuickWindow redefined in QQuickWindowQmlImpl

import QtQuick
import QtWebEngine

Window {
    width: 640
    height: 480
    visible: true

    WebEngineView {}
}