### 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)

PROP_NONE,
			PROP_INLINE,
			PROP_SETGET,
		};
		PropertyStyle property = PROP_NONE;
		union {
			FunctionNode *setter = nullptr;
			IdentifierNode *setter_pointer;
		};
		IdentifierNode *setter_parameter = nullptr;
		union {
			FunctionNode *getter = nullptr;
			IdentifierNode *getter_pointer;
		};
		bool exported = false;
		bool onready = false;
		PropertyInfo export_info;
		int assignments = 0;
		bool is_static = false;
#ifdef TOOLS_ENABLED
		String doc_description;
#endif 
		VariableNode() {