WASM: Browser tab stops responding on aborting NetworkRequest

The attached example performs a HTTP-Request to a webserver and an invalid port that always will fail. There is a timeout that calls abort after 3 seconds to stop the running request.

It does not work with Qt 5.15.0 Beta 4(emsdk 1.39.8) Single/Multithreaded.
It works if the app is built for Windows.

It worked with Qt 5.14.0 Beta 2(emsdk 1.39.0).

I also tested it with the new QNetworkRequest::setTransferTimeout instead of the timer,
this works in Windows but fails in the browser too.

I attached the project to reproduce and the built wasm apps.