Shaders not working together with MC-164001 painting transparency fix

[Skeithh]

What happened?

Using the transparency fix for paintings (and other textures) from this mojang issue, I expected to have my paintings that have transparency to well... Do exactly as you'd expect- be transparent.

Unfortunately, when I have shaders on using Iris, transparency completely breaks again.
I tested this with the following shaders:
-BSL v8.1.02.1
-Prismarine V4.0
-Beyond Belief Legacy v1.2.1

First image in the lineup is how it looks like with shaders toggled off. Every other image is in the listed testing order.

Screenshots

Relevant log output

No response

Minecraft Version

1.18.1

Iris Version

iris-mc1.18.1-1.2.0-pre.jar

Sodium Version

sodium-fabric-mc1.18.1-0.4.0-alpha6+build.14.jar

Operating System

Windows 10

What is your GPU?

Radeon (TM) RX 480 Graphics

Java Version

Java 17

Additional context

latest.log

[AlsoSylv]

This fix is a core shader to make entities transparent, a different fix on the side of iris would be required if someone cares to look into this issue.

[coderbot16]

Vanilla core shaders are not supported when using an Iris shader pack, see this issue:

#1042

[coderbot16]

Unfixable, core shaders are not supported.