### 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)

return !(this->operator==(p_other));
		}
		void operator=(const DataType &p_other) {
			kind = p_other.kind;
			type_source = p_other.type_source;
			is_read_only = p_other.is_read_only;
			is_constant = p_other.is_constant;
			is_meta_type = p_other.is_meta_type;
			is_pseudo_type = p_other.is_pseudo_type;
			is_coroutine = p_other.is_coroutine;
			builtin_type = p_other.builtin_type;
			native_type = p_other.native_type;
			enum_type = p_other.enum_type;
			script_type = p_other.script_type;
			script_path = p_other.script_path;
			class_type = p_other.class_type;
			method_info = p_other.method_info;
			enum_values = p_other.enum_values;
			unset_container_element_type();
			if (p_other.has_container_element_type()) {
				set_container_element_type(p_other.get_container_element_type());
			}
		}
		DataType() = default;