Its a Qt bug not a pyqt bug and you can likely workaround it by turning off hardware acceleration as described in https://doc.qt.io/qt-6/qtwebengine-debugging.html
As for updating the Qt version, that will happen next in calibre 7 but to Qt 6.5.3 not Qt 6.6.0 as .0 Qt releases are very buggy.
Its a Qt bug not a pyqt bug and you can likely workaround it by turning /doc.qt. io/qt-6/ qtwebengine- debugging. html
off hardware acceleration as described in
https:/
As for updating the Qt version, that will happen next in calibre 7 but
to Qt 6.5.3 not Qt 6.6.0 as .0 Qt releases are very buggy.