I have a TLS and a non-TLS server in the same rotation:

eu.irc6.net          6667  IRCnet     tls
irc.in.tum.de        6667  IRCnet     

When I use /connect IRCnet while not connected to a v6 capable net, I get a connection error trying to reach the v6 server, and then a TLS protocol error from the other server, even though that doesn't have a tls flag. If I interrupt with /rmreconns and give a new /connect IRCnet command, it works if the first server it tries is the non-TLS server, so it seems that the tls flag is stuck between connection attempts.

This is irssi 1.0.7 as found in Debian stable and 1.2.0 as found in Debian stable-backports.