Qt 6.8.2 has a more fine-grained workaround:
https://codereview.qt-project.org/c/qt/qtwebengine-chromium/+/606122
This never seems to have it made to Qt 6.9+, but I can't seem to reproduce the
issue anymore (neither with PDF.js nor with Google Sheets), even on older
affected Qt versions, even on older Intel hardware. Maybe something else (mesa
etc.?) changed and this was fixed there?
Let's reenable this and find out if it breaks things again for someone.
Fixes#8346
See #7489, #8001, #8006