### Godot version

4.0.2.stable (7a0977c)

### System information

Ubuntu 22.04, x86_64, LLVM

### Issue description

When performing a dedicated server export with:
- a `ShaderMaterial` (a `canvas_item` shader used on a `Panel` in the example below)
- a build with `disable_3d=yes`

the resulting export gives the following error when run:
```
ERROR: Cannot get class 'PlaceholderMaterial'.
   at: instantiate (core/object/class_db.cpp:326)
ERROR: res://main.tscn:Resource of unrecognized type in file: PlaceholderMaterial.
   at: load (core/io/resource_format_binary.cpp:778)
ERROR: Failed loading resource: res://.godot/exported/206107301/export-3070c538c03ee49b7677ff960a3f5195-main.scn. Make sure resources have been imported by opening the project in the editor at least once.
   at: _load (core/io/resource_loader.cpp:223)
ERROR: Failed loading scene: res://main.tscn
   at: start (main/main.cpp:2965)
```

I would expect things to work here without an error - there's no 3D in use here and a normal export with the same build does run as expected.

### Steps to reproduce

1. Build godot with `disable_3d=yes`.
2. Create a new project, and add a `Panel` node.
3. Add a `canvas_item` shader as the material for the `Panel` node.
4. Perform a dedicated server export using the build from step 1.
5. Run the exported binary and observe the error.

### Minimal reproduction project

[DedicatedServer2DTest.zip](https://github.com/godotengine/godot/files/11597444/DedicatedServer2DTest.zip)

#include "scene/3d/node_3d.h"
#include "scene/3d/occluder_instance_3d.h"
#include "scene/3d/path_3d.h"
#include "scene/3d/physics_body_3d.h"
#include "scene/3d/ray_cast_3d.h"
#include "scene/3d/reflection_probe.h"
#include "scene/3d/remote_transform_3d.h"
#include "scene/3d/shape_cast_3d.h"
#include "scene/3d/skeleton_3d.h"
#include "scene/3d/skeleton_ik_3d.h"
#include "scene/3d/soft_body_3d.h"
#include "scene/3d/spring_arm_3d.h"
#include "scene/3d/sprite_3d.h"
#include "scene/3d/vehicle_body_3d.h"
#include "scene/3d/visible_on_screen_notifier_3d.h"
#include "scene/3d/voxel_gi.h"
#include "scene/3d/world_environment.h"
#include "scene/3d/xr_nodes.h"
#include "scene/resources/environment.h"
#include "scene/resources/fog_material.h"
#include "scene/resources/importer_mesh.h"
#include "scene/resources/mesh_library.h"
#endif 
static Ref<ResourceFormatSaverText> resource_saver_text;
static Ref<ResourceFormatLoaderText> resource_loader_text;
static Ref<ResourceFormatLoaderCompressedTexture2D> resource_loader_stream_texture;
static Ref<ResourceFormatLoaderCompressedTextureLayered> resource_loader_texture_layered;
static Ref<ResourceFormatLoaderCompressedTexture3D> resource_loader_texture_3d;
static Ref<ResourceFormatSaverShader> resource_saver_shader;
static Ref<ResourceFormatLoaderShader> resource_loader_shader;