### Godot version

Godot 4.0 RC 2

### System information

Windows 11

### Issue description

As the title states you get no autocompletion when statically typing.
Of course the code still works, but it shouldn't be neccessary to cast an object to a type it already is.

### Steps to reproduce

1. Create child class with some functionality
![image](https://user-images.githubusercontent.com/100119945/220173809-0b2b2788-d986-4fa7-815c-444268d09c32.png)

2. Get node in parent class and call childs function
![image](https://user-images.githubusercontent.com/100119945/220174167-5ff3c8e9-863e-4fbd-a3cf-d88d34597b39.png)



### Minimal reproduction project

N/A
if (_debug_parse_err_line >= 0) {
		return;
	}
	ERR_FAIL_INDEX(p_level, _call_stack.stack_pos);
	int l = _call_stack.stack_pos - p_level - 1;
	GDScriptInstance *instance = _call_stack.levels[l].instance;
	if (!instance) {
		return;
	}
	Ref<GDScript> scr = instance->get_script();
	ERR_FAIL_COND(scr.is_null());
	const HashMap<StringName, GDScript::MemberInfo> &mi = scr->debug_get_member_indices();
	for (const KeyValue<StringName, GDScript::MemberInfo> &E : mi) {
		p_members->push_back(E.key);
		p_values->push_back(instance->debug_get_member_by_index(E.value.index));
	}
}
ScriptInstance *GDScriptLanguage::debug_get_stack_level_instance(int p_level) {