[Eisenstein]

Is this a test feature? I don't see it in my gmail.

[fantasizr]

I've pretty much avoided it by going to Gmail->Settings and disabling "smart" features:

Smart Reply: (Show suggested replies when available.)

Smart features: When you turn this setting on, you agree to let Gmail, Chat, and Meet use your content and activity in these products to provide smart features and personalize your experience.

[maupin]

Same. I haven't seen this. And I hope I never do unless I specifically click a button to enable it.