Antialiasing fails on first line of sign editing screen with Iris Shaders

Environment

• Caxton version: 0.6.0-alpha.1
• Minecraft version: 1.21
• Mod loader and version: Fabric Loader 0.15.11, Fabric API 0.100.6+1.21
• Operating system and CPU architecture: Linux x86_64
• Other mods: Sodium 0.5.11+mc1.21, Iris-1.7.3+mc1.21

Summary

Text on the first line of the sign editing screen is not antialiased

Steps to reproduce

1. Apply one of the bundled resource packs
2. Place a sign
3. Enter text on the first two lines of the editing screen

Expected behavior: Text should render identically on the first and second lines.

Actual behavior: The text on the first line is not antialiased, while the text on the second line is.

Relevant logs and/or screenshots

latest.log