Server List doesn't show external 3rd party servers

The server list for 'friends servers' does not show external servers from remote hosts:
e.g.:
add beta.inpvp.net (occasionally going up and down whilst we debug)
add sg.lbsg.net

Former uses MiNET, latter uses PocketMine-MP.
Both presumably have correct packets being sent.

PocketMine and MiNET both show in player list when running on a local network, remote they do not. Please, please, please fix. It's causing some bad harm to player counts on server networks.