[REG 5.13 -> 5.14.0] XMLHttpRequest crashes in QML WorkerThread

Starting from Qt 5.14.0, using XMLHttpRequest to send a HTTP request in QML WorkerThread code crashes. Before, it worked ok. Seems to be related to the fact that it now attempts to do this in qqmlxmlhttprequest.cpp:

QQmlXMLHttpRequest *r = new QQmlXMLHttpRequest(scope.engine->qmlEngine()->networkAccessManager(), scope.engine);

vs. Qt 5.13:

QQmlXMLHttpRequest *r = new QQmlXMLHttpRequest(scope.engine->v8Engine->networkAccessManager(), scope.engine);

QML WorkerThread has a separate JS engine, where the new code using qmlEngine() call crashes.

To reproduce crash: Unzip 'crash.zip' and run "qmlscene Bug.qml"