REG: Wrong result value in QMessageBox::warning detected in version 6.7.1

Steps to reproduce the issue:

1. Build and run the attached example with Qt version 6.7.1

The bug can be seen on this line of code: 

QMessageBox::warning(qApp->activeWindow(), "title", "text", "answer 0", "answer 1", "", 1, 1);

The result for "answer 0" is 2, "answer 1" is 3. This bug is not seen on Qt5, Qt 6.6.1, Qt 6.7.0