### 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)

}
#ifdef DEBUG_ENABLED
	if (EngineDebugger::is_active()) {
		String signature;
		
		if (!p_script->get_script_path().is_empty()) {
			signature += p_script->get_script_path();
		}
		
		if (p_func) {
			signature += "::" + itos(p_func->body->start_line);
		} else {
			signature += "::0";
		}
		
		if (p_class->identifier) {
			signature += "::" + String(p_class->identifier->name) + "." + String(func_name);
		} else {
			signature += "::" + String(func_name);
		}
		if (p_for_lambda) {
			signature += "(lambda)";
		}
		codegen.generator->set_signature(signature);
	}
#endif
	if (p_func) {
		codegen.generator->set_initial_line(p_func->start_line);
	} else {
		codegen.generator->set_initial_line(0);