### 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 = FOR_VARIABLE;
				bind = p_identifier;
				name = p_identifier->name;
				source_function = p_source_function;
				start_line = p_identifier->start_line;
				end_line = p_identifier->end_line;
				start_column = p_identifier->start_column;
				end_column = p_identifier->end_column;
				leftmost_column = p_identifier->leftmost_column;
				rightmost_column = p_identifier->rightmost_column;
			}
		};
		Local empty;
		Vector<Local> locals;
		HashMap<StringName, int> locals_indices;
		FunctionNode *parent_function = nullptr;
		IfNode *parent_if = nullptr;
		bool has_return = false;
		bool has_continue = false;
		bool has_unreachable_code = false; 
		bool is_in_loop = false; 
		bool has_local(const StringName &p_name) const;
		const Local &get_local(const StringName &p_name) const;
		template <class T>
		void add_local(T *p_local, FunctionNode *p_source_function) {