It's s common issue on most samsung display including iphone and oneplus face the same because there were using samsung display for their phone. Some issue solved after the next update. Some have to replase the display. Better go service centre if possible. or wait for the a week or two for the patch update
Samsung Note 9 Display Problems Please Join only if you are facing the Display discoloration or Overheating or horizontal lines on display when the brightness is set to low. All these issues are started recently after software update, not by any accidental or physical damage to display. https://t.me/samsungDisplayProblem
Please register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
