I created a forward rule from one of my production servers to my test server(approximately 700k MPH). The production server is 9.5.1.66, the dev server is 9.6.3.3.
The first configuration was using UDP on port 514. This worked as expected, messages were received and logged. The second config was using TCP on port 1468. This did not work. No messages were received from the prod server.
I then specifically added the IP address of the dev server to the 'Bind to Address' box and applied the config. This did work with messages being received and logged on the dev server.
This still would be a bug as the documentation states that the TCP socket will bind to all interfaces and it appears that it does not.