### 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 = CONSTANT;
		}
	};
	struct ContinueNode : public Node {
		ContinueNode() {
			type = CONTINUE;
		}
	};
	struct DictionaryNode : public ExpressionNode {
		struct Pair {
			ExpressionNode *key = nullptr;
			ExpressionNode *value = nullptr;
		};
		Vector<Pair> elements;
		enum Style {
			LUA_TABLE,
			PYTHON_DICT,
		};
		Style style = PYTHON_DICT;
		DictionaryNode() {
			type = DICTIONARY;
		}
	};
	struct ForNode : public Node {
		IdentifierNode *variable = nullptr;
		ExpressionNode *list = nullptr;
		SuiteNode *loop = nullptr;
		ForNode() {