### 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)

OP_NONE,
			OP_ADDITION,
			OP_SUBTRACTION,
			OP_MULTIPLICATION,
			OP_DIVISION,
			OP_MODULO,
			OP_POWER,
			OP_BIT_SHIFT_LEFT,
			OP_BIT_SHIFT_RIGHT,
			OP_BIT_AND,
			OP_BIT_OR,
			OP_BIT_XOR,
		};
		Operation operation = OP_NONE;
		Variant::Operator variant_op = Variant::OP_MAX;
		ExpressionNode *assignee = nullptr;
		ExpressionNode *assigned_value = nullptr;
		bool use_conversion_assign = false;
		AssignmentNode() {
			type = ASSIGNMENT;
		}
	};
	struct AwaitNode : public ExpressionNode {
		ExpressionNode *to_await = nullptr;
		AwaitNode() {
			type = AWAIT;
		}
	};
	struct BinaryOpNode : public ExpressionNode {
		enum OpType {