When using this new feature "Advanced Colored Lighting" Occasionally there is a Spider like Shadow that can span across the terrain from your location.

I spoke to the Shader Devs about this on their Discord, and said it's most likely caused by this compatibility mod. Tried it without it, and all worked fine, so here I am posting this. Let me know if there is anything else I can provide to find a solution to this.

Version 1.20.1 Flywheel Compat 1.7+ Iris

Same issue with #89. This issue has been fixed.