QDate::fromString() fails on isolated dates on macOS with TZ=Europe/Lisbon

qDebug() << QDate::fromString("1978-04-02", "yyyy-MM-dd");
qDebug() << QDate::fromString("02-04-1978", "dd-MM-yyyy");

QString format("yyyy-MM-dd");
for (int year=1930; year <= 2030; ++year)
{
	QDate date(year,1,1);
	while (date != QDate(year+1,1,1))
	{
		QString str = date.toString(format);
		QDate converted = QDate::fromString(str, format);
		if (converted != date)
			qDebug() << date << converted;
		date = date.addDays(1);
	}
}