Strange flickering grain effect during sunlight while outside

im getting a strange flickering during the day while outside, its not very strong, looks like some sort of fine black grain while moving.. it hapoens mostly in sunlight and on vegetation terrain, not so much on concrete and also not inside buildings which is why i think its linked to the sunrays or shadows or vegetation outside.

its not super strong but visible and annoying.

playing on pc. intel i9900k rtx 4070ti super 16gb 32gb ram win10