Unfortunately for whatever reason this is _not_ the way the current version of ircu works. Both +p and +s are totally hidden from /list (it doesn't even show a "*" or "Prv" like some older ircd versions did).
At 08:28 AM 6/12/2003 +0100, Chris Crowther wrote:
Although afaic we know longer send "Prv" as the channel name for a Private
(+p) channel...I don't know if anyone ever did tbh. I believe the intended
operation is that Private channels will show up on LIST, without their topic,
but membership of the channel is not visible through use of NAMES, WHO or
WHOIS, unless the client using the command is in the channel anyway. Secret
(+s) channels are hidden on LIST as well as membership information being
hidden.