What happened?

With Iris-mc1.19.3-1.5.1 all horses render their markings over the top of their armor.

I have reproduced this consistently with only Iris and Sodium installed and no resourcepacks used.
Simply load a world, tame a horse and place any horse armor on it.

Screenshots

Log output

No response

Minecraft Version

Minecraft 1.19.3

Iris Version

1.5.1

Operating System

Windows 10

What is your GPU?

Nvidia Geforce GTX 1060

Additional context

This has been reported before for an older version.

Duplicate of #1365.