### 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)

LITERAL,
			MATCH,
			MATCH_BRANCH,
			PARAMETER,
			PASS,
			PATTERN,
			PRELOAD,
			RETURN,
			SELF,
			SIGNAL,
			SUBSCRIPT,
			SUITE,
			TERNARY_OPERATOR,
			TYPE,
			TYPE_TEST,
			UNARY_OPERATOR,
			VARIABLE,
			WHILE,
		};
		Type type = NONE;
		int start_line = 0, end_line = 0;
		int start_column = 0, end_column = 0;
		int leftmost_column = 0, rightmost_column = 0;
		Node *next = nullptr;
		List<AnnotationNode *> annotations;
#ifdef DEBUG_ENABLED
		Vector<GDScriptWarning::Code> ignored_warnings;
#endif
		DataType datatype;
		virtual DataType get_datatype() const { return datatype; }