how to suppress console output from QWebEngineView errors?

I get the following error if I create a QWebEngineView instance from Python instances in different working directories:

[2452:9872:1108/052617.050:ERROR:cache_util_win.cc(21)] Unable to move the cache: Access is denied. (0x5)
[2452:9872:1108/052617.050:ERROR:cache_util.cc(135)] Unable to move cache folder C:UsersAdamAppDataLocalpythonQtWebEngineDefaultGPUCache to C:UsersAdamAppDataLocalpythonQtWebEngineDefaultold_GPUCache_000
[2452:9872:1108/052617.051:ERROR:disk_cache.cc(184)] Unable to create cache
[2452:9872:1108/052617.056:ERROR:shader_disk_cache.cc(606)] Shader Cache Creation failed: -2

from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineWidgets
from PyQt5.QtCore import Qt
app = QtWidgets.QApplication([])
x = QtWebEngineWidgets.QWebEngineView()
x.load(QtCore.QUrl('http://example.com/'))

It seems this is a known issue and will be fixed in QT6: https://bugreports.qt.io/browse/QTBUG-66014

But in the meantime, how can I suppress this message? I tried changing QtCore.qInstallMessageHandler and also x.page().javaScriptConsoleMessage = lambda self, level, msg, line, sourceID: None, neither affected this message.

Answer

One possible solution is to raise the level of the chromium log:

import os
from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineWidgets

os.environ["QTWEBENGINE_CHROMIUM_FLAGS"] = "--enable-logging --log-level=3"
app = QtWidgets.QApplication([])
x = QtWebEngineWidgets.QWebEngineView()
# ...