Ok so there are no specific errors for your display. However I could find the screen you use and as I have read it it only supports 120hz. Maybe in Kernel 6.6 it was displayed wrong and was actually running at 120 hz. Since 60hz is also not an option in windows i highly doubt that your display is capable of running 60 hz.
This is the page for the specs of your display:
https://www.panelook.com/ATNA40CU03-002_Samsung_14.0_OLED_parameter_66977.html