Blocks will have a bunch of weird lines on them when there are shadows. I haven't seen this on a previous version of the shader but have just noticed it when updating to the latest build.

NVIDIA
Windows
1.21
Vanilla Launcher
Iris
Bliss Main

The bug can be seen when at a certain distance away. It goes away when super close or when further away.

The only shader setting I found to fix it was bringing up the resolution. What made it even worse was to turn up the shadow distance very high.

It would be interesting to have the option to adjust Shadow Bias to one's liking in order to mitigate this.

This is called shadow acne and there is not much that can be done about it apart from messing with the shadow bias.

yeah, i changed the bias a bit a while ago trying to fine tune it, its really tricky getting it to adjust for different combinations of shadow resolution and shadow distance.

a setting to personally adjust it shouldnt be needed if i do it better.