### 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 = CAST;
		}
	};
	struct EnumNode : public Node {
		struct Value {
			IdentifierNode *identifier = nullptr;
			ExpressionNode *custom_value = nullptr;
			EnumNode *parent_enum = nullptr;
			int index = -1;
			bool resolved = false;
			int64_t value = 0;
			int line = 0;
			int leftmost_column = 0;
			int rightmost_column = 0;
#ifdef TOOLS_ENABLED
			String doc_description;
#endif 
		};
		IdentifierNode *identifier = nullptr;
		Vector<Value> values;
		Variant dictionary;
#ifdef TOOLS_ENABLED
		String doc_description;
#endif 
		EnumNode() {