### 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)

if (variable->getter != nullptr) {
					Error err = _parse_setter_getter(p_script, p_class, variable, false);
					if (err) {
						return err;
					}
				}
			}
		}
	}
	{
		
		Error err = OK;
		_parse_function(err, p_script, p_class, nullptr);
		if (err) {
			return err;
		}
	}
	if (p_class->onready_used) {
		
		Error err = OK;
		_parse_function(err, p_script, p_class, nullptr, true);
		if (err) {
			return err;
		}
	}
	if (p_class->has_static_data) {
		Error err = OK;
		GDScriptFunction *func = _make_static_initializer(err, p_script, p_class);
		p_script->static_initializer = func;
		if (err) {