### 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 (!ClassDB::get_integer_constant_enum(p_class, p_enum_constant)) {
		return ScriptLanguage::LOCATION_OTHER;
	}
	int depth = 0;
	StringName class_test = p_class;
	while (class_test && !ClassDB::get_integer_constant_enum(class_test, p_enum_constant, true)) {
		class_test = ClassDB::get_parent_class(class_test);
		depth++;
	}
	return depth | ScriptLanguage::LOCATION_PARENT_MASK;
}
static String _trim_parent_class(const String &p_class, const String &p_base_class) {
	if (p_base_class.is_empty()) {
		return p_class;
	}
	Vector<String> names = p_class.split(".", false, 1);
	if (names.size() == 2) {
		String first = names[0];
		String rest = names[1];
		if (ClassDB::class_exists(p_base_class) && ClassDB::class_exists(first) && ClassDB::is_parent_class(p_base_class, first)) {
			return rest;
		}
	}
	return p_class;
}
static String _get_visual_datatype(const PropertyInfo &p_info, bool p_is_arg, const String &p_base_class = "") {