### 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)

public:
	
	struct AnnotationNode;
	struct ArrayNode;
	struct AssertNode;
	struct AssignableNode;
	struct AssignmentNode;
	struct AwaitNode;
	struct BinaryOpNode;
	struct BreakNode;
	struct BreakpointNode;
	struct CallNode;
	struct CastNode;
	struct ClassNode;
	struct ConstantNode;
	struct ContinueNode;
	struct DictionaryNode;
	struct EnumNode;
	struct ExpressionNode;
	struct ForNode;
	struct FunctionNode;
	struct GetNodeNode;
	struct IdentifierNode;
	struct IfNode;
	struct LambdaNode;
	struct LiteralNode;
	struct MatchNode;
	struct MatchBranchNode;
	struct ParameterNode;
	struct PassNode;