ReadDatagram create a QHostAddress incorrect

On a reception of an UDP broadcast from an ipv4 address (192.168.0.1). The QHostAddress retrieve by socket->readDatagram() has some field that are wrong.

QHostAddress::toString() create a string "::ffff:192.168.0.1" because QHostAddress::protocol() return QAbstractSocket::IPv6Protocol.
And in the Qt source there are a piece of code that create this weird ip address string because it detect it is an ipv4 address but the QHostAddress say that is an ipv6 address.

On a 5.3 Qt version, the protocol is correctly set to IPv4Protocol and the toString function generate 192.168.0.1. I'm not sure when this bug appears but it was between the 5.3 and the 5.6 version.