here you can see pink/white flashes of the leaves as they pass in front of the screen, and strange artifacts at the bottom of the screen related to the horse near the end.

here you can see very obvious white flashes and glowing white eyes. This is at the abandoned mansion where you insert the 3 bog witch daggers into a statue.

At one point all cobwebs looked like this in dark areas too, (although verifying game files has seemed to fixed this).

Ryzen 7 5800X
RTX 3080 (466.27) (no overclock)
Windows 10 64-Bit

Only began as of v1.21.1 as far as I'm aware.

@colocheto I assume you mean invisible, not invincible. Try reinstalling the game, or verifying your files through Uplay. Try reinstalling GPU drivers, or downgrading them to an earlier version.