QVariant::canConvert behaves inconsistently with the documentation

On Qt 6 QVariant::canConvert behaves differently than on Qt 5 and inconsistently with the documentation.

The following code:

QVariant variant = QVariant::fromValue(new QObject());
qDebug() << variant.canConvert<QAbstractItemModel*>();
qDebug() << variant.canConvert<QObject*>();

prints false/true on Qt 5, but true/true on Qt 6.

Moreover, according to docs

A QVariant containing a pointer to a type derived from QObject will also return true for this function if a qobject_cast to the template type T would succeed. 

what is not a case on a Qt 6, as

qobject_cast<QAbstractItemModel*>(new QObject())

gives null, obviously.