### 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)

codegen.generator->pop_temporary();
				}
			}
		}
	}
	
	if (p_func) {
		if (optional_parameters > 0) {
			codegen.generator->start_parameters();
			for (int i = p_func->parameters.size() - optional_parameters; i < p_func->parameters.size(); i++) {
				const GDScriptParser::ParameterNode *parameter = p_func->parameters[i];
				GDScriptCodeGenerator::Address src_addr = _parse_expression(codegen, r_error, parameter->initializer);
				if (r_error) {
					memdelete(codegen.generator);
					return nullptr;
				}
				GDScriptCodeGenerator::Address dst_addr = codegen.parameters[parameter->identifier->name];
				codegen.generator->write_assign_default_parameter(dst_addr, src_addr, parameter->use_conversion_assign);
				if (src_addr.mode == GDScriptCodeGenerator::Address::TEMPORARY) {
					codegen.generator->pop_temporary();
				}
			}
			codegen.generator->end_parameters();
		}
		
		r_error = _parse_block(codegen, p_func->body, true, false);
		if (r_error) {
			memdelete(codegen.generator);
			return nullptr;
		}