### 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)

signature += p_script->get_script_path();
		}
		
		signature += "::0";
		
		if (p_class->identifier) {
			signature += "::" + String(p_class->identifier->name) + "." + String(func_name);
		} else {
			signature += "::" + String(func_name);
		}
		codegen.generator->set_signature(signature);
	}
#endif
	codegen.generator->set_initial_line(p_class->start_line);
	GDScriptFunction *gd_function = codegen.generator->write_end();
	memdelete(codegen.generator);
	return gd_function;
}
Error GDScriptCompiler::_parse_setter_getter(GDScript *p_script, const GDScriptParser::ClassNode *p_class, const GDScriptParser::VariableNode *p_variable, bool p_is_setter) {
	Error err = OK;
	GDScriptParser::FunctionNode *function;
	if (p_is_setter) {
		function = p_variable->setter;
	} else {
		function = p_variable->getter;
	}
	_parse_function(err, p_script, p_class, function);
	return err;
}
Error GDScriptCompiler::_populate_class_members(GDScript *p_script, const GDScriptParser::ClassNode *p_class, bool p_keep_state) {