### 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 = TYPE;
		}
	};
	struct TypeTestNode : public ExpressionNode {
		ExpressionNode *operand = nullptr;
		TypeNode *test_type = nullptr;
		DataType test_datatype;
		TypeTestNode() {
			type = TYPE_TEST;
		}
	};
	struct UnaryOpNode : public ExpressionNode {
		enum OpType {
			OP_POSITIVE,
			OP_NEGATIVE,
			OP_COMPLEMENT,
			OP_LOGIC_NOT,
		};
		OpType operation = OP_POSITIVE;
		Variant::Operator variant_op = Variant::OP_MAX;
		ExpressionNode *operand = nullptr;
		UnaryOpNode() {
			type = UNARY_OPERATOR;
		}
	};
	struct VariableNode : public AssignableNode {
		enum PropertyStyle {