### 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
} else if (callee_type == GDScriptParser::Node::SUBSCRIPT && static_cast<const GDScriptParser::SubscriptNode *>(call->callee)->is_attribute) {
						if (!_guess_expression_type(c, static_cast<const GDScriptParser::SubscriptNode *>(call->callee)->base, base)) {
							found = false;
							break;
						}
					} else {
						break;
					}
					
					if (base.type.is_constant && base.value.get_type() == Variant::OBJECT) {
						GDScriptParser::DataType native_type = base.type;
						while (native_type.kind == GDScriptParser::DataType::CLASS) {
							native_type = native_type.class_type->base_type;
						}
						while (native_type.kind == GDScriptParser::DataType::SCRIPT) {
							if (native_type.script_type.is_valid()) {
								Ref<Script> parent = native_type.script_type->get_base_script();
								if (parent.is_valid()) {
									native_type.script_type = parent;
								} else {
									native_type.kind = GDScriptParser::DataType::NATIVE;
									native_type.builtin_type = Variant::OBJECT;
									native_type.native_type = native_type.script_type->get_instance_base_type();
									if (!ClassDB::class_exists(native_type.native_type)) {
										native_type.kind = GDScriptParser::DataType::UNRESOLVED;
									}
								}
							}
						}
						if (native_type.kind == GDScriptParser::DataType::NATIVE) {