### 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
ClassDB::get_integer_constant(context.current_class->extends[0]->name, p_symbol, &success);
		if (success) {
			r_result.type = ScriptLanguage::LOOKUP_RESULT_CLASS_CONSTANT;
			r_result.class_name = context.current_class->extends[0]->name;
			r_result.class_member = p_symbol;
			return OK;
		}
	}
	bool is_function = false;
	switch (context.type) {
		case GDScriptParser::COMPLETION_BUILT_IN_TYPE_CONSTANT_OR_STATIC_METHOD: {
			if (!Variant::has_builtin_method(context.builtin_type, StringName(p_symbol))) {
				
				r_result.type = ScriptLanguage::LOOKUP_RESULT_CLASS_CONSTANT;
				r_result.class_name = Variant::get_type_name(context.builtin_type);
				r_result.class_member = p_symbol;
				return OK;
			}
			
			GDScriptParser::DataType base_type;
			base_type.kind = GDScriptParser::DataType::BUILTIN;
			base_type.builtin_type = context.builtin_type;
			if (_lookup_symbol_from_base(base_type, p_symbol, true, r_result) == OK) {
				return OK;
			}
		} break;
		case GDScriptParser::COMPLETION_SUPER_METHOD:
		case GDScriptParser::COMPLETION_METHOD: {
			is_function = true;
			[[fallthrough]];