Can't set material rid of inherited material class #1883

Godot version

4.5.1.stable

godot-cpp version

4.5.stable

System information

All supported systems

Issue description

I'm currently developing a custom material type that inherits directly from the material class. My problem is that the get_rid and get_material methods are always returns a null RID. Even if I override _get_rid, it remains unchanged.

I investigated a bit more closely and it seems that the set_material method of the Material class is missing within the engine in the C++ bindings.

This seems to be a problem in GDScript as well.

I thought it was possible, since the documentary claims this:
Importantly, you can inherit from Material to create your own custom material type in script or in GDExtension.

Steps to reproduce

1. Create a new C++ Class and inherit from Material
2. Create a new material using godot::RenderingServer::get_singleton()->material_create(); and set a shader using godot::RenderingServer::get_singleton()->material_set_shader(m_MaterialRid, Shader);
3. Overwrite godot::RID _get_rid() const and return the RID, which was created using material_create.
4. Try to set a uniform variable godot::RenderingServer::get_singleton()->material_set_param(get_rid(), "metallic", 2.0); or godot::RenderingServer::get_singleton()->material_set_param(get_rid(), "metallic", 2.0);
5. You will get an error message, that the RID is null.

Minimal reproduction project

N/A