What happened?

Pixels on (modded) entities that are almost transparent but not quite don't have the correct translucency when using shaders. They are correct when not using shaders however.

Screenshots

This is OptiFIne

This is Iris

Images provided by lolyou230 on discord
Mod is AdventureZ, this occurs with all entities in AdventureZ

Relevant log output

[19:17:26] [main/INFO]: Configured alpha test override for gbuffers_basic: AlphaTestOverride { GREATER 0.1 }
[19:17:26] [main/WARN]: [gbuffers_textured] Unsupported uniform: vec4 entityColor
[19:17:26] [main/WARN]: [gbuffers_textured] Unsupported uniform: sampler2DShadow shadowtex0
[19:17:26] [main/WARN]: [gbuffers_textured] Unsupported uniform: sampler2D texture

This is the only thing in the logs relating to entities

Iris and Minecraft Version

Iris 1.1.0 for Minecraft 1.16.5

Are you running Sodium along with Iris?

Yes

Operating System

Windows 10

What is your GPU?

NVIDIA GeForce GTX 1060

Java Version

Java 8

Additional context

This is technically AdventureZ's fault because they're using fake transparent pixels, but considering that OptiFine does not have this issue it may be worth it to implement. Properly transparent pixels do work, as seen on the vanilla chicken.