In my test a few moments ago, I’m seeing JOIN and PART using TWITCHCLIENT 1:
TWITCHCLIENT 1
:mximos!mximos@mximos.tmi.twitch.tv PART #bwana
:ochrisgold!ochrisgold@ochrisgold.tmi.twitch.tv JOIN #bwana
:gardonmade!gardonmade@gardonmade.tmi.twitch.tv JOIN #bwana
:purpledragon15!purpledragon15@purpledragon15.tmi.twitch.tv PART #bwana
:racecondition!racecondition@racecondition.tmi.twitch.tv PART #bwana