### 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 ("Variant" == p_symbol) {
		r_result.type = ScriptLanguage::LOOKUP_RESULT_CLASS;
		r_result.class_name = "Variant";
		return OK;
	}
	if ("PI" == p_symbol || "TAU" == p_symbol || "INF" == p_symbol || "NAN" == p_symbol) {
		r_result.type = ScriptLanguage::LOOKUP_RESULT_CLASS_CONSTANT;
		r_result.class_name = "@GDScript";
		r_result.class_member = p_symbol;
		return OK;
	}
	GDScriptParser parser;
	parser.parse(p_code, p_path, true);
	GDScriptParser::CompletionContext context = parser.get_completion_context();
	context.base = p_owner;
	
	if (context.type != GDScriptParser::COMPLETION_ATTRIBUTE) {
		
		
		if (GDScriptUtilityFunctions::function_exists(p_symbol) || "assert" == p_symbol || "preload" == p_symbol) {
			r_result.type = ScriptLanguage::LOOKUP_RESULT_CLASS_METHOD;
			r_result.class_name = "@GDScript";
			r_result.class_member = p_symbol;
			return OK;
		}
	}
	GDScriptAnalyzer analyzer(&parser);
	analyzer.analyze();
	if (context.current_class && context.current_class->extends.size() > 0) {
		bool success = false;