What happened?

I built a glass roof for my underwater building，I could see the strange shadow when I look up.

Screenshots

Relevant log output

No response

Iris and Minecraft Version

iris-mc1.17-1.1.1.jar for minecraft 1.17.1

Are you running Sodium along with Iris?

Yes

Operating System

Windows 10

What is your GPU?

RTX 2060

Java Version

Java 16

Additional context

No response

Known bug with sodium.
Here is the relevant issue
CaffeineMC/sodium#38