### 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)

type = VARIABLE;
		}
	};
	struct WhileNode : public Node {
		ExpressionNode *condition = nullptr;
		SuiteNode *loop = nullptr;
		WhileNode() {
			type = WHILE;
		}
	};
	enum CompletionType {
		COMPLETION_NONE,
		COMPLETION_ANNOTATION, 
		COMPLETION_ANNOTATION_ARGUMENTS, 
		COMPLETION_ASSIGN, 
		COMPLETION_ATTRIBUTE, 
		COMPLETION_ATTRIBUTE_METHOD, 
		COMPLETION_BUILT_IN_TYPE_CONSTANT_OR_STATIC_METHOD, 
		COMPLETION_CALL_ARGUMENTS, 
		
		COMPLETION_GET_NODE, 
		COMPLETION_IDENTIFIER, 
		COMPLETION_INHERIT_TYPE, 
		COMPLETION_METHOD,