Customizable Elytra's banner Elytras fail to render with Iris and 3d Skin Layers

[val-int1]

What happened?

As discussed in Hidoni/CustomizableElytra#31, I'm opening an issue here about a rendering issue with Customizable Elytra when an elytra has banner patterns while using both Iris and 3d Skin Layers. The issue does not happen if either of the two mods is absent.

Screenshots

How the elytra looks like with either mod installed (but not both) How the elytra looks like with both mods installed

Log output

latest.log

Minecraft Version

Minecraft 1.20.1

Iris Version

iris-mc1.20.1-1.6.8.jar

Operating System

Kubuntu 23.04

What is your GPU?

AMD Radeon RX 6600

Additional context

Other mods used:

• Fabric Loader 0.14.22
• Fabric API 0.87.0+1.20.1
• Customizable Elytra 2.1.0+1.20
• 3d Skin Layers 1.5.4-mc1.20.1
• Sodium 0.5.2
• Indium 1.0.25+mc1.20.1

[val-int1]

Note that the screenshots (and the log) were using the integrated graphics of my CPU (a AMD Ryzen 7 5700G), but I double-checked after ensuring it would use the actual GPU and the problem still is present.

[Aulberon]

The problem still persists.

This is what the creator of Customizable Elytras said about it: https://github.com/Hidoni/CustomizableElytra/issues/31#issuecomment-1712309348