QTableWidget and QTableView show an extra vertical border to the right of every item cell, using Qt 6.8.2 on Windows 11.

This issue is visible in Designer with a QTableWidget (example .ui file attached), as well as in compiled applications containing custom QTableViews. Replacing the 6.8.2 DLLs with the 6.8.1 DLLs in the build directory removes the issue.

EDIT: After further testing, styles/qmodernwindowsstyle.dll seems to be the sole culprit.

Appearance with Designer 6.8.1 (expected behavior, no grid lines are shown):

Appearance with Designer 6.8.2 (unexpected vertical lines are visible):