This addon leaves the ‘Services’ channel permanently but retains ‘Trade’ and ‘General’.
These two channels are filtered OFF for all chat windows apart from the specified ‘spam’ window; which in this case is chat frame 1 (configurable).
https://www.curseforge.com/wow/addons/leave-spam-channels
If you used a version of this addon from earlier today just overwrite it with the updated one above.
If you need to re-enable any missing channels just type:
/join General
/Join Trade
/Join Services
Or type /lsc.