thijn, this bug is not happening rightly after you open the server. Actually I think it is something random ...
Let me explain how I greet this bug:
I open my server and everything works fine. Then, after some time (I am not monitorizing it) it still gives the success message, but it doesn't appear in the masterlist. (even if I refresh the master list many times)
Sometimes it purely appear online, when I give a refresh, then it dissappear after a second refresh, and re-appear after the third refresh.
(not sure if this is happening anymore)