### Godot version

4.1.0

### System information

Windows 10, i711800H, Forward+ Vulkan

### Issue description

When using @export_group("Name") in a BaseClass, then inheriting from that BaseClass in another class and there also using @export_group("Name"), with the same group name, then running the project and re-saving the inherited class the project crashes with 
```
ERROR: FATAL: Index p_index = 3 is out of bounds (size() = 3).
   at: get (./core/templates/cowdata.h:155)
```

sometimes the editor crashes too after a while.

### Steps to reproduce

1. open reproduction project
2. Run the project.
3. Open the "super"script
4. Press CTRL + S to save it.

### Minimal reproduction project

[MRP_.zip](https://github.com/godotengine/godot/files/12137412/MRP_.zip)

type = GROUP;
				annotation = p_annotation;
			}
		};
		IdentifierNode *identifier = nullptr;
		String icon_path;
		Vector<Member> members;
		HashMap<StringName, int> members_indices;
		ClassNode *outer = nullptr;
		bool extends_used = false;
		bool onready_used = false;
		bool has_static_data = false;
		bool annotated_static_unload = false;
		String extends_path;
		Vector<IdentifierNode *> extends; 
		DataType base_type;
		String fqcn; 
#ifdef TOOLS_ENABLED
		String doc_description;
		String doc_brief_description;
		Vector<Pair<String, String>> doc_tutorials;
		
		void set_enum_value_doc(const StringName &p_name, const String &p_doc_description) {
			ERR_FAIL_INDEX(members_indices[p_name], members.size());
			members.write[members_indices[p_name]].enum_value.doc_description = p_doc_description;
		}
#endif 
		bool resolved_interface = false;
		bool resolved_body = false;
		Member get_member(const StringName &p_name) const {