Ok, found nothing during my search.
Possible bug.
mIRC for some reason doesn't allow users to join channels greater than 89 characters. (This is excluding the #.)
Even though the maximum length of a channel is 200 (On some networks.)
[01:18:01] <@OperServ> [14:55:44] CREATE #ORqwSjzQPNROszucfmLaCYFLagAJFDHLHFETJCwpRYzFwnITvHukpJbvvBCMxLogrsxZhHFvcpxDcaWOknNnUhDCApigphMNOwMqPtysHGnSctcYwqxRwRSGIeJQnFaabLmXVgXjbnamWvNwPgPfJaPXoQyYrPVrfwzIJalNWyvpDAzdHVypnZfmntZARIyfTrFsrcK by Jigsy
[01:18:01] <@OperServ> [14:55:44] PART #ORqwSjzQPNROszucfmLaCYFLagAJFDHLHFETJCwpRYzFwnITvHukpJbvvBCMxLogrsxZhHFvcpxDcaWOknNnUhDCApigphMNOwMqPtysHGnSctcYwqxRwRSGIeJQnFaabLmXVgXjbnamWvNwPgPfJaPXoQyYrPVrfwzIJalNWyvpDAzdHVypnZfmntZARIyfTrFsrcK by Jigsy ()
Even though it's possible for U:lined services and socket clones to join.
[01:21:59] <- :JigsClone!Sock-Slut@myhiddenhost JOIN #ORqwSjzQPNROszucfmLaCYFLagAJFDHLHFETJCwpRYzFwnITvHukpJbvvBCMxLogrsxZhHFvcpxDcaWOknNnUhDCApigphMNOwMqPtysHGnSctcYwqxRwRSGIeJQnFaabLmXVgXjbnamWvNwPgPfJaPXoQyYrPVrfwzIJalNWyvpDAzdHVypnZfmntZARIyfTrFsrcK
[01:21:59] <- :CA1.FadedTrust.Net 353 JigsClone = #ORqwSjzQPNROszucfmLaCYFLagAJFDHLHFETJCwpRYzFwnITvHukpJbvvBCMxLogrsxZhHFvcpxDcaWOknNnUhDCApigphMNOwMqPtysHGnSctcYwqxRwRSGIeJQnFaabLmXVgXjbnamWvNwPgPfJaPXoQyYrPVrfwzIJalNWyvpDAzdHVypnZfmntZARIyfTrFsrcK :JigsClone @OperServ
This a bug ... or a feature?