GUI texture corruption with TextTask:setBackground(true) and Iris

[lumiscosity]

Bug Description

Trying to render a TextTask's background with the Iris mod installed and shaders enabled corrupts GUI textures.

Reproduction Steps

Note: This was tested on 1.18.2.

• Install Iris (and its dependency Sodium) alongside Figura
• Add a shader pack (the bug does not occur without a shader pack present and selected)
• Select this avatar.
• Enable shaders.

Log File

https://mclo.gs/gWoIRDm
Tested here with BSL and Figura 0.1.5.rc6, though I have confirmed the issue happens with Complementary Unbound and Figura 0.1.4 as well.