Channel name in IRC is channel id when joining a channel newly created in webui.

[keeperofdakeys]

When added to a newly created channel in the web interface - either added by yourself, or added by another user - the irc channel name that the irc client automatically joins is the mattermost channel id, instead of the channel name. Any messages to that channel then become irc direct messages from the user, instead of messages in the channel.

Eg: You join "fiwgdqzr1ib33pkx5bb9c6mzha" instead of "testing"..

Reconnecting to the server will connect to the correct channel, and messages will correctly appear in the channel.

This issue occurred on irssi 1.1.1, with mattermost 4.9.0 and matterircd 0.17.3.

[42wim]

Thanks for reporting.
I've just fixed this in master.