QNetworkProxyFactory::systemProxyForQuery always returns the same list on OS X 10.10.2

On OS X 10.10.2, with QT 5.4.0 I tried getting a list of all available proxies via QNetworkProxyFactory::systemProxyForQuery. The function always returns a list of length 1 with a dummy entry that has no hostname set, port 0 and is of type NoProxy.

In our test setup, the OS X machine is connected to two interfaces (i.e. has two IP addresses of different networks assigned to one ethernet interface) that could theoretically have two different proxy settings configured.

Regardless of proxy settings on either interface, the minimal sample I attached always produces the following output:

Number of proxies: 1
---------- Proxy 0 ----------
Hostname: 
Port: 0
Type: 2
Transparent: 1
Caching: 0
Capabillities: 7