### 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 = ANNOTATION;
		}
	};
	struct ArrayNode : public ExpressionNode {
		Vector<ExpressionNode *> elements;
		ArrayNode() {
			type = ARRAY;
		}
	};
	struct AssertNode : public Node {
		ExpressionNode *condition = nullptr;
		ExpressionNode *message = nullptr;
		AssertNode() {
			type = ASSERT;
		}
	};
	struct AssignableNode : public Node {
		IdentifierNode *identifier = nullptr;
		ExpressionNode *initializer = nullptr;
		TypeNode *datatype_specifier = nullptr;
		bool infer_datatype = false;
		bool use_conversion_assign = false;
		int usages = 0;
		virtual ~AssignableNode() {}
	protected:
		AssignableNode() {}
	};
	struct AssignmentNode : public ExpressionNode {
		
		enum Operation {