Re: "*** #debian: You're not on that channel"

[J.P.]

Emanuel Berg via General discussion about ERC <emacs-erc@gnu.org>
writes:

> Messages like this
>
>   *** #debian: You're not on that channel
>
> appear when I leave channels. I don't know why?

Looks like that's ERR_NOTONCHANNEL (442) [1]. Are you connected to
multiple networks when this happens? And how are you leaving these
channels, by issuing manual /PARTs in the channel buffers themselves? If
you're able to reproduce this, mind capturing some logs with
`erc-toggle-debug-irc-protocol'?

[1] https://modern.ircdocs.horse/#errnotonchannel-442