Timestring without seconds not parsed correctly when using Qt::ISODate

Running the code below produces:

false
true

but both results should be true.

Since the time is still valid according to ISO 8601 [1][2] section 4.2.2.3, it would be expected that QTime::fromString() returns a valid QTime instance representing 10:00.

[1] http://isotc.iso.org/livelink/livelink/4021199/ISO_8601_2004_E.zip?func=doc.Fetch&nodeid=4021199
[2] http://dotat.at/tmp/ISO_8601-2004_E.pdf

Code to reproduce:
// -----------------------------------------
#include <QtCore>

int main( int argc, char * argv[] )
{
QCoreApplication app( argc, argv );

QTime time = QTime::fromString( "10:00", Qt::ISODate );
qDebug() << time.isValid();

time = QTime::fromString( "10:00", "hh:mm" );
qDebug() << time.isValid();

return 0;
}
// -----------------------------------------