UR Sim with PROFINET device

Some more detail: I am using URSim 5.9.4. EIP works fine. when I start Profinet. I do see a new thread created listening on port 40002. But the PLC on the same network cannot reach to it.

When I switch to newer version of URSim, both EIP and PN changes behavior, once enabled, it immediately turns the LED to green and PN device name SimulatedIO is created. But there is no longer PN thread listening on any port. Is this intentional, are you removing the capability of fieldbus connection to URSim and make it pure simulation?