Found this bug on S23 Ultra, and contacted Samsung Support and they have no solution and no idea at all. End up I figured the temporary solution for this problem. All you need to do is switch to Buttons in navigation bar setting, the Swipe Gestures is causing this bottom text flickering problem.
It's a bug from Google messages app. Maybe try updating the app to the latest version. Or go back to the previous version of the app.
Thank you. Let me try this.
Your most welcome 👍
Switch to "Messages" by Samsung solve the problem. The Google Messages has issue.
It happens on my S22U as well. End up, I deleted affected messages😂
It's not a big issue, I just can't stand the flickering keep happening in my eyes. 😄