Black squares (artifacts) in the sky when it rains

[LANCE (1980) FR]

Hello, before arriving in Kravch, it starts to rain, and the clouds form transparent black squares that disappear when I move the camera. I'm playing on an RTX 5080, and I don't have any issues like this in my other games.
Do you have the same visual artifacts? Thank you very much.

[LANCE (1980) FR]

Sometimes when I look at the sky, it's actually slightly gridded...
Thanks for your help.