### 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
Variant base_val;
						Variant::construct(base.type.builtin_type, base_val, nullptr, 0, err);
						bool valid = false;
						Variant res = base_val.get(index.value, &valid);
						if (valid) {
							r_type = _type_from_variant(res);
							r_type.value = Variant();
							r_type.type.is_constant = false;
							found = true;
						}
					}
				}
			} break;
			case GDScriptParser::Node::BINARY_OPERATOR: {
				const GDScriptParser::BinaryOpNode *op = static_cast<const GDScriptParser::BinaryOpNode *>(p_expression);
				if (op->variant_op == Variant::OP_MAX) {
					break;
				}
				GDScriptParser::CompletionContext context = p_context;
				context.current_line = op->start_line;
				GDScriptCompletionIdentifier p1;
				GDScriptCompletionIdentifier p2;
				if (!_guess_expression_type(context, op->left_operand, p1)) {
					found = false;
					break;
				}
				if (!_guess_expression_type(context, op->right_operand, p2)) {
					found = false;
					break;
				}