### 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 = BREAK;
		}
	};
	struct BreakpointNode : public Node {
		BreakpointNode() {
			type = BREAKPOINT;
		}
	};
	struct CallNode : public ExpressionNode {
		ExpressionNode *callee = nullptr;
		Vector<ExpressionNode *> arguments;
		StringName function_name;
		bool is_super = false;
		CallNode() {
			type = CALL;
		}
		Type get_callee_type() const {
			if (callee == nullptr) {
				return Type::NONE;
			} else {
				return callee->type;
			}
		}
	};
	struct CastNode : public ExpressionNode {
		ExpressionNode *operand = nullptr;
		TypeNode *cast_type = nullptr;
		CastNode() {