What happened?

This is very simple. Old shader packs (which perform much better than new shaders - even "low-end" ones) do not work properly and shroud the world in darkness. Chocapic V3, SEUS V8, Rudoplays, Paolo's and Docteurdread's shaders all have this problem.

Screenshots

No response

Log output

No response

Minecraft Version

1.20.1

Iris Version

1.6.9

Operating System

MacOS 10.15.7

What is your GPU?

Intel Iris Plus

Additional context

No response