### 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)

if (type_source == UNDETECTED || p_other.type_source == UNDETECTED) {
				return true; 
			}
			if (type_source == INFERRED || p_other.type_source == INFERRED) {
				return true; 
			}
			if (kind != p_other.kind) {
				return false;
			}
			switch (kind) {
				case VARIANT:
					return true; 
				case BUILTIN:
					return builtin_type == p_other.builtin_type;
				case NATIVE:
				case ENUM: 
					return native_type == p_other.native_type;
				case SCRIPT:
					return script_type == p_other.script_type;
				case CLASS:
					return class_type == p_other.class_type || class_type->fqcn == p_other.class_type->fqcn;
				case RESOLVING:
				case UNRESOLVED:
					break;
			}
			return false;
		}
		bool operator!=(const DataType &p_other) const {