Array functions create "Object type function is not derived from QObject or QQmlComponent" warnings

import QtQuick
import QtQuick.Controls.Basic

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello foo Button!")

    property list<Button> foo: []
    property bool hasFooButtons: foo.some(el => el.text === "foo")
}