Callsign from 3DEN only work on server, but not client

[bardosy 154]

I know it's just a very minor thing... But if I change the callsign of a group in 3DEN editor (eg for "Red One" instead of "Alpha 2-2") it works fine on server (on my side). If I test the mission and use sideChat, it shows "Red One". But if an other player join to me and play with me, he saw the original group name "Alpha 2-2" in the radio chat.

I know, I can define callsign in description.ext and it will work, I am just curious, is it a known 3DEN bug?