Accessing `byteLength` on an ArrayBuffer constructed from an empty QByteArray throws error

Q_PROPERTY(QByteArray foo READ foo WRITE setFoo NOTIFY fooChanged)
Q_PROPERTY(QByteArray bar READ bar WRITE setBar NOTIFY barChanged)

console.log(obj);
console.log(obj.foo);
console.log(obj.foo.byteLength);

console.log(obj.bar);
console.log(typeof obj.bar);
console.log(obj.bar.constructor.name);
console.log('byteLength' in obj.bar);
try {
    console.log(obj.bar.byteLength);
} catch (error) {
    console.error(error);
}
try {
    console.log(typeof obj.bar['byteLength']);
} catch (error) {
    console.error(error);
}

qml: MyObject(0x5640bdc0a0e0)
qml: Some Text
qml: 9
qml: 
qml: object
qml: ArrayBuffer
aml: true
qml: TypeError: Type error
qml: TypeError: Type error

void test(QJSEngine *engine, const QByteArray &ba) {
  qDebug() << "TEST with" << ba;
  auto value = engine->toScriptValue(ba);
  engine->globalObject().setProperty("myarray", value);

  QStringList trace;
  const auto result = engine->evaluate(R"(
(function(){
    return myarray.byteLength;
})()
)",
"script.js", 1, &trace);

  if (result.isError()) {
    qDebug() << "ERROR" << result.toString();
    qDebug() << "TRACE:";
    qDebug().noquote() << trace.join("\n");
  } else {
    qDebug() << "OK:" << result.toNumber();
  }
  qDebug() << "";
}

test(&engine, "Some Text");
test(&engine, {});

TEST with "Some Text"
 OK: 9

TEST with ""
 ERROR "TypeError: Type error"
 TRACE:
 :3:-1:[file:script.js|file:///script.js]
 %entry:2:-1:[file:script.js|file:///script.js]