### Godot version

4.0.beta16

### System information

Windows 10 Pro x64, GLES3, RTX 3080 Ti (528.02)

### Issue description

In Compatibility/GLES3 back-end, shaders which use a uniform to get the normal roughness buffer cannot compile. For example, the shader:
```glsl
shader_type spatial;

uniform sampler2D normal_roughness_texture : hint_normal_roughness_texture;

void fragment() {
    vec4 sample = texture(normal_roughness_texture, UV);
}
```
results in an error in the output:
```
  drivers/gles3/shader_gles3.cpp:242 - SceneShaderGLES3: Fragment shader compilation failed:
  0(890) : error C1503: undefined variable "normal_roughness_buffer"
  
  drivers/gles3/shader_gles3.cpp:342 - Method/function failed.
```

If I switch over to the Mobile or Forward+ backends, there is no shader compilation error.

### Steps to reproduce

Open the attached reproduction in the 4.0.beta16 editor.

When the scene is opened, the error is produced automatically:
1. Open `scene.tscn`
2. Open Output to review error

When the scene is saved with any changes made to the shader, the same error is also produced:
1. Open `scene.tscn`
2. Open `example.gdshader` in the shader editor.
3. Make a compile-able change to the shader.
4. Save the scene
5. Open Output to review the error

### Minimal reproduction project

[NormalRoughnessTexture_GLES3_Error.zip](https://github.com/godotengine/godot/files/10534253/NormalRoughnessTexture_GLES3_Error.zip)

OperatorNode *func = alloc_node<OperatorNode>();
					func->op = OP_CONSTRUCT;
					if (precision != PRECISION_DEFAULT) {
						func->return_precision_cache = precision;
					}
					VariableNode *funcname = alloc_node<VariableNode>();
					funcname->name = get_datatype_name(datatype);
					func->arguments.push_back(funcname);
					int carg = -1;
					bool ok = _parse_function_arguments(p_block, p_function_info, func, &carg);
					if (carg >= 0) {
						completion_type = COMPLETION_CALL_ARGUMENTS;
						completion_line = tk_line;
						completion_block = p_block;
						completion_function = funcname->name;
						completion_argument = carg;
					}
					if (!ok) {
						return nullptr;
					}
					if (!_validate_function_call(p_block, p_function_info, func, &func->return_cache, &func->struct_name)) {
						_set_error(vformat(RTR("No matching constructor found for: '%s'."), String(funcname->name)));
						return nullptr;
					}
					expr = _reduce_expression(p_block, func);
				}
			}
		} else if (tk.type == TK_IDENTIFIER) {
			_set_tkpos(prepos);
			StringName identifier;