AMS 2 / griddy Sky on new Monitor

Hello, I have a new monitor (LG45 OLED 21:9) and now I've noticed that there is a fine grid in the sky. It's a bit like the effect you get when playing VR. Is that normal on a screen like this? I play in 3440x1440 with the highest graphics settings. I have an RTX3090. Thank you for your help.

PS: in other games (ACC, LMU etc.) i dont have this "effect"

 

Yep its there usually at lower sun times.

 

That improves by activating the supersampling setting but it cost lost of fps

 

i use supersampling in medium