When I get a text message, a preview of the message used to appear in the notifications, with suggested responses.  Now I just get this generic message each time and I have to press it to go to the app to see the message.  (See below)

I tried switching over to the Chrome messaging app and it works fine with proper previews. So it's definitely something to do with the Samsung Messages app, it's not a problem with a general setting on my phone.