I did this other test, that message appears only on Simosnap. Here's what came out in detail:
TEST : @time=2025-08-05T10:23:05.996Z :resurrection.simosnap.com 311 MyNick OtherNick1 OtherNick2 SimosNap-87ed5q.retail.thenthis.de * :...
TEST : @time=2025-08-05T10:23:05.996Z :resurrection.simosnap.com 312 MyNick OtherNick1 lab.simosnap.com :SBG 3 Lab SimosNap IRC Server
TEST : @time=2025-08-05T10:23:05.996Z :resurrection.simosnap.com 344 MyNick OtherNick1 DE :is connecting from Germany
TEST : @time=2025-08-05T10:23:05.996Z :resurrection.simosnap.com 330 MyNick OtherNick1 OtherNick2 :is logged in as
TEST : @time=2025-08-05T10:23:05.996Z :resurrection.simosnap.com 671 MyNick OtherNick1 :is using a secure connection
TEST : @time=2025-08-05T10:23:05.996Z :resurrection.simosnap.com 318 MyNick OtherNick1 :End of /WHOIS list.
TEST : @account=MyNick;time=2025-08-05T10:23:06.251Z :MyNick!ID@SimosNap-ud3fed.bla.bla.okokok.net MODE #Try123 +bb *!*@SimosNap-87ed5q.retail.thenthis.de :R:OtherNick2
TEST : @time=2025-08-05T10:23:06.264Z :lab.simosnap.com KICK #Try123 OtherNick1 :Banned
TEST : @time=2025-08-05T10:23:15.127Z PING :ZNC
While when I tried it on GameSurge this came out:
TEST : :Prothid.NY.US.GameSurge.net 311 MyNick OtherNick1 ~OtherNick1 OtherNick1.user.gamesurge * :...
TEST : :Prothid.NY.US.GameSurge.net 319 MyNick OtherNick1 :#Try123
TEST : :Prothid.NY.US.GameSurge.net 312 MyNick OtherNick1 *.GameSurge.net :The GameSurge IRC Network
TEST : :Prothid.NY.US.GameSurge.net 330 MyNick OtherNick1 OtherNick1 :is logged in as
TEST : :Prothid.NY.US.GameSurge.net 318 MyNick OtherNick1 :End of /WHOIS list.
TEST : :MyNick!~R4klbs3o@gamesurge-8fb37c1b.retail.thenthis.de MODE #Try123 +bb *!*@OtherNick1.user.gamesurge *!*@R:OtherNick1
I haven't tried other networks because if I have to do it I have to register the nickname, if necessary I'll do it
