Mine works just fine. Try to take people's advice and wipe cache and data for Google or factory reset your device. Also, try a package disabler app and disable bixby ... that should definitely resolve any conflict between Google assistant and bixby that might be occurring on your device. Also, what was the update? System level update, or an update for something in the Galaxy apps store? I'm on Verizon and never got a system level update 3 weeks ago, so I'm confused with what you're referring to. You need to be more specific if you want assistance. Can't just go "whichever one Samsung released this week" because that means literally nothing to anyone trying to assist you.