### Godot version

4.0 rc1

### System information

Windows 11, GTX 1080Ti, Vulkan

### Issue description

Automplete can't find any variables and methods on custom classes when the nodes are loaded with `@onready`:

simple_rotate.gd:
```gdscript
extends Node2D
class_name SimpleRotate

@export var shouldRotate : bool = true
```

machine.gd:
```gdscript
@onready var wheel1 : SimpleRotate = $Wheel

func start_motor():
	wheel1.sho... # Doesn't autocomplete, it can't find shouldRotate 
```

If I add another cast like below, autocomplete does work:
machine.gd:
```gdscript
@onready var wheel1 : SimpleRotate = $Wheel as SimpleRotate

func start_motor():
	wheel1.shouldRotate = true # Autocomplete works
```

To make things even weirder, it does work if I make Wheel into a unique name and access it using %:
machine.gd:
```gdscript
@onready var wheel1 : SimpleRotate = $"%Wheel"

func start_motor():
	wheel1.shouldRotate = true # Autocomplete works
```


### Steps to reproduce

- Create a script with a class_name
- Add that script to a node
- Create another script referencing the node with the type of the script
- Try to let automcomplete find any methods or variables on the script with the class_name
- Notice that it fails

### Minimal reproduction project

N/A
case GDScriptParser::COMPLETION_OVERRIDE_METHOD: {
			GDScriptParser::DataType base_type = context.current_class->base_type;
			if (_lookup_symbol_from_base(base_type, p_symbol, true, r_result) == OK) {
				return OK;
			}
		} break;
		case GDScriptParser::COMPLETION_PROPERTY_DECLARATION_OR_TYPE:
		case GDScriptParser::COMPLETION_TYPE_NAME_OR_VOID:
		case GDScriptParser::COMPLETION_TYPE_NAME: {
			GDScriptParser::DataType base_type = context.current_class->get_datatype();
			if (_lookup_symbol_from_base(base_type, p_symbol, false, r_result) == OK) {
				return OK;
			}
		} break;
		case GDScriptParser::COMPLETION_ANNOTATION: {
			const String annotation_symbol = "@" + p_symbol;
			if (parser.annotation_exists(annotation_symbol)) {
				r_result.type = ScriptLanguage::LOOKUP_RESULT_CLASS_ANNOTATION;
				r_result.class_name = "@GDScript";
				r_result.class_member = annotation_symbol;
				return OK;
			}
		} break;
		default: {
		}
	}
	return ERR_CANT_RESOLVE;
}
#endif