Describe the bug
while shader is active in iris, nightvision potions have no effect on brightness.

To Reproduce
give yourself nightvision effect either via command or potion

Context
running the latest (non beta) version for 1.21.x of iris and latest shader of modrinth!

would have been nice if it would work as i often use nightvision instead of torches while caving/mining.

Okay I think I've got this fixed now, thanks for pointing it out