Hiya! I'm able to do /rn * on main but not on mainnorth. I can't take a screenshot because the input is not displayed with the output. But if you do /rn * on main and mainnorth, you should be able to reproduce the problem.
I have just tried to /rn * on main north and seems to work fine. Maybe there wasn't any players with a nickname? Spoiler
Okay, I can't reproduce it either now . . . You're right, it works on main and mainnorth. . . hmm, I wonder what I was doing wrong. .. If I see it again I'll let you know! <3