consider:

a b c

in on OPEN, $1- = a b c and $0 = 3.

while $comchan($nick,$0) { tokenize 32 $1- $v1 } 

the loop starts at $comchan($nick, 3) with $0 strictly increasing. $comchan($nick, 1) and $comchan($nick, 2) are never added to the list.