A feature was added in 1.3.2 that allowed players to hide the IPs of the servers in your server list, which is very useful for streamers who want to protect the addresses of private servers. Some time between then and now, this feature stopped working, and it was not noted in the patch notes as far as I am aware. It would be nice for this to be fixed, for the privacy of players.

Here is an image of how hiding the IP of a nonexistant server appeared in 1.3.2: