I’m not sure what I’m doing wrong, but recently, when I reply to a text message, I immediately receive a vibration and the message that I just replied to shows back up.
I have also experienced this. If I have another notification in the shade and then I reply to a new one that just came in, I might get a vibration and see that older one as if it just came through.
Should be fixed in 1.13 (not released yet)
I think this is maybe partially an issue with Google Messages. I got the same thing when I was using a WearOS watch.