When you use device in night with all lights off and phones brihhtness is low and using dark mode then you will see pinkish color while scrolling text like in setting apps or in browsing too
Kindly complaint to Samsung customer support through Samsung Members App as error report also send log files Along with this error report for this issue and wait for next update may be fix it by Samsung team soon. If you like please accept as a solution it's help to others users also, click on 3dots in my reply section and click on accept solution. Thanks.
As per your query, we want to inform you that this is not a bug or issue, It happens due to the Adaptive brightness feature enabled on your Samsung device, this feature allows the touchscreen to automatically adjust its brightness based on the surrounding environment, you can follow the below steps for resolve your device issue:
Path: Settings app> Display >then tap the Adaptive brightness switch to activate it/ deactivate it.
If the issue persists, kindly report the problems with a log file. To share a log file, click on the Samsung Members Application (Open Samsung Members Application > Support> Tap on send feedback> Choose Composer> Select error report> select the appropriate issue category> Type your query and send.)
