value returned by ListModel::get() doesn't reflect call to set() if get() has already been called

ListModel {
    id: model

    Component.onCompleted: {
        model.append({"attrs": []})
        model.get(0)
        model.set(0, {"attrs": [{'abc': 123, 'def': 456}] } )
        print("attrs:", model.get(0).attrs.count)
    }
}