Bug: Editor no longer hides internal classes in node creation dialog

### Godot version

4.5.stable

### godot-cpp version

4.5.stable

### System information

Windows 10

### Issue description

In godot 4.3 when we used `register_internal_class` to register a class it was not getting exposed and it was not possible to create or view it in new node creation dialog. In Godot 4.5 it doesn't matter if class is registered with internal or regular `p_exposed` doesn't seem working.

### Steps to reproduce

1. Create a class
2. Register using `register_internal_class`
```cpp
ClassDB::register_internal_class();
```
3. Open editor, Open add node dialog and search `MyNode` and it will be there.

### Minimal reproduction project

No Required