Atomics objects TypeError when running in QML

We have been developing test cases for Squish CoCo QML analysis.
I was trying to develop a test case where I try to use Javascript Atomics -objects in QML code.

My problem is that it seems the Qt qml runners returns a TypeError for these type of static objects, even they are listed here

Issue can be reproduced with a simple code snippet as follows:

import QtQuick 2.15

QtObject {
    Component.onCompleted: {
        const buffer = new ArrayBuffer(16)  // Same issue with SharedArrayBuffer
        const uint8 = new Uint8Array(buffer)
        uint8[0] = 7
        console.log(Atomics.load(uint8, 0))
        Qt.callLater(Qt.quit)
    }
}

Reproduced with both, Qt6.3.1 and Qt 5.15.10