Can't understand the meaning of returned exception USER_BANNED_IN_CHANNEL on sending chatAction to the supergroup while @TrueMafiaBot (id: 468253535) is a member of that supergroup (e.g. -1001639443192) and has all required permissions.
Looks like a #bug. I know about 3000 groups with similar bot behaviour.
I tell my users to give admin permissions to the bot - it helps to avoid described behaviour.