MODEL_NORMAL_MATRIX documented for fragment shaders but not present in GLSL

[itsybitesyspider]

Godot version

4.2

System information

Godot v4.2.stable.mono - Windows 10.0.22621 - Vulkan (Forward+) - dedicated AMD Radeon RX 6600 XT (Advanced Micro Devices, Inc.; 31.0.22011.4008) - AMD Ryzen 9 5900 12-Core Processor (24 Threads)

Issue description

I wrote a 3D fragment shader using MODEL_NORMAL_MATRIX, which is documented as one of the builtins available in fragment shaders.

(https://docs.godotengine.org/en/stable/tutorials/shaders/shader_reference/spatial_shader.html#fragment-built-ins)

The shader does not show any error within godot, however when I tried to run the project, I see this:

E 0:00:01:0437   _compile_variant: Failed parse:
WARNING: 0:81: '' : all default precisions are highp; use precision statements to quiet warning, e.g.:
         "precision mediump int; precision highp float;" 
ERROR: 0:2342: 'model_normal_matrix' : undeclared identifier 
ERROR: 0:2342: '' : compilation terminated 
ERROR: 2 compilation errors.  No code generated.

  <C++ Source>   servers/rendering/renderer_rd/shader_rd.cpp:294 @ _compile_variant()

(As an aside, the value I actually wanted was MODELVIEW_NORMAL_MATRIX which is not documented to be supported in fragment shaders at all.)

Steps to reproduce

Make a 3D fragment shader that uses MODEL_NORMAL_MATRIX and try to run the project that uses the shader.

Actual: Godot gives the above error. Observe that the shader editor does not show any error. Also observe that the documentation says that this should work.

Expected: The feedback from the shader editor, the documentation and the actual behavior should all match.

Minimal reproduction project

model-normal-matrix-demo-project.zip