I got these soft shadow artifacts lately, and can’t remember what could cause this. These lines stretch infinitely across any objects and planes. I tried moving my project to unity 6 but the problem persisted.
not sure, but maybe incorrect shadow bias settings in your light source can lead to these artifacts. If the bias is too low, shadows can “bleed” onto surfaces, creating lines or streaks.
Try adjust the Shadow Bias and Normal Bias in your light source settings. Increase these values slightly and check if the artifacts disappear