### 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
}
			if (_lookup_symbol_from_base(base.type, p_symbol, is_function, r_result) == OK) {
				return OK;
			}
		} break;
		case GDScriptParser::COMPLETION_TYPE_ATTRIBUTE: {
			if (context.node == nullptr || context.node->type != GDScriptParser::Node::TYPE) {
				break;
			}
			const GDScriptParser::TypeNode *type = static_cast<const GDScriptParser::TypeNode *>(context.node);
			GDScriptParser::DataType base_type;
			const GDScriptParser::IdentifierNode *prev = nullptr;
			for (const GDScriptParser::IdentifierNode *E : type->type_chain) {
				if (E->name == p_symbol && prev != nullptr) {
					base_type = prev->get_datatype();
					break;
				}
				prev = E;
			}
			if (base_type.kind != GDScriptParser::DataType::CLASS) {
				GDScriptCompletionIdentifier base;
				if (!_guess_expression_type(context, prev, base)) {
					break;
				}
				base_type = base.type;
			}
			if (_lookup_symbol_from_base(base_type, p_symbol, is_function, r_result) == OK) {
				return OK;
			}
		} break;