Forums Bug Reports Perform option/on Connect inconsistency

Not a bug. This occurs because you try to join the channel too fast, before nickserv has a change to set mode +r on you. The server will not allow you to join +R channels until you have mode +r.

Stick a

.timer 1 1

before your join command and you will see the problem disappear.

Or code an event to wait for the mode change and THEN join the channel.