ASSERT with Keys.forwardTo with 2 elements when used in a C++ application

import QtQuick 2.2
import QtQuick.Window 2.1

Window {
    width: 100
    height: 100
    visible: true

    Item {
        focus: true
        Keys.forwardTo: [item1, item2]
    }
    Item {
        id: item1
        Keys.onPressed: console.log("item1 keys="+event.key)
    }
    Item {
        id: item2
        Keys.onPressed: console.log("item2 keys="+event.key)
    }
}

ASSERT: "e->isAccepted()" in file items\qquickitem.cpp, line 4490