I have the option enabled in my A71 but when a SMS text message arrives the popup on the status bar only shows the preview of the message. In my wife's A9 phone with same "Suggest Actions and Replies" option enabled she sees a preview with actions for a quick reply or if the incoming message is a CODE for two-way authentication, then she can click on the popup "code" to capture it into the clipboard. She has the same settings enabled as I do on my A71.
We are both using the default Samsung Messages app.
I've tried a different SMS app, e.g. Google Messages but no differences.