Python: QtWebEngineWidgets.QWebEngineView hangs the app on a particular Fedora PC

As Friedemann Kleint advised, I re-report bug PYSIDE-2072 here.

Consider the following code:

from PySide6 import QtWebEngineWidgets, QtWidgets

app = QtWidgets.QApplication()
w = QtWebEngineWidgets.QWebEngineView()
w.setGeometry(0, 0, 600, 400)
w.show()
app.exec()

It works on all my computers but one. There, I have Fedora 35 installed. On the PC, it hangs, making the window unresponsive. The appeared window indefinitely waits for a futex to be released, not responding to anything. Recently, I upgraded the OS to Fedora 37, with the same result (there, I have Python 3.11).

In stderr, I see the following:

qt.webenginecontext:

GL Type: desktop
 Surface Type: OpenGL
 Surface Profile: CompatibilityProfile
 Surface Version: 4.3
 QSG RHI Backend: OpenGL
 Using Supported QSG Backend: yes
 Using Software Dynamic GL: no
 Using Multithreaded OpenGL: no

Init Parameters:
 * application-name mwe.py
 * browser-subprocess-path venv/lib64/python3.10/site-packages/PySide6/Qt/libexec/QtWebEngineProcess
 * create-default-gl-context
 * disable-features ConsolidatedMovementXY,InstalledApp,BackgroundFetch,WebOTP,WebPayments,WebUSB,PictureInPicture
 * disable-setuid-sandbox
 * disable-speech-api
 * enable-features NetworkServiceInProcess,TracingServiceInProcess
 * enable-threaded-compositing
 * enable-use-zoom-for-dsf false
 * in-process-gpu
 * use-gl desktop

I've had no luck deciphering the values.

To reproduce,

1. create a Python virtual environment: python -m venv venv
2. activate it: source venv/bin/activate
3. update pip and wheel (just in case): pip install -U pip wheel
4. install PySide6: pip install PySide6
5. feed the code to Python:

• either launch python and paste the code there
• or save the code into a file and do python <filename>.py

The expected result is a window of a white rectangle appearing, which can be resized by mouse, minimized, or closed.

Instead, a white rectangle appears, but it doesn't respond to anything.

I can't provide a C++ MWE for it.