This was introduced in 6.8.0 rc; previous 6.8 betas were not affected.

Just add the following to main() in a empty project

    QDate testDate = QDate::fromString("2024-09-25","yyyy-MM-dd");

This causes an assert in debug builds on current MSVC 2022 (17.11.2, 17.11.4) but not on the default MinGW chain.

ASSERT: "maximum.date().toJulianDay() == 5373484" in file C:\Users\qt\work\qt\qtbase\src\corelib\time\qdatetimeparser.cpp, line 1617