Oreo's "Autofill with Google" tries to "autofill" the SMS entry field in Messages
This isn't a bug. People use to enter phone numbers too while sending messages sometimes that's why it pops up as per me. I use single sim card and this does not pops up here. Worth to mention that I use beta version of Google app. You can turn the service off. Go to Settings/System/Languages &amp; input. Tap the Advanced tab to reveal more options. Now choose Autofill service and select "none".