### Godot version

ef025711a

### System information

ArchLinux x11

### Issue description

Accessing a scene unique node like this:
```gdscript
class_name Class extends Node
static func get_label() -> Label:
	return %label
```
and then accessing that class later:
```gdscript
func _ready() -> void:
	Main.get_label().text = "hello world"
```
causes a strange error when in the editor, and a normal error when run directly.
![image](https://user-images.githubusercontent.com/70787919/229785642-6aad4e31-6bd9-4eb5-bee4-7445b48a99bb.png)
```c++
ERROR: Node not found: "%label" (relative to "/root/main").
   at: get_node (scene/main/node.cpp:1364)
```
Instead of returning null.
As opposed to when using `get_node`:
```

SCRIPT ERROR: Cannot call method 'get_node' on a null value.
          at: get_label (res://main.gd:5)
SCRIPT ERROR: Invalid set index 'text' (on base: 'Nil') with value of type 'String'.
          at: _ready (res://control.gd:4)
```

### Steps to reproduce

Run mrp or follow outlined steps

### Minimal reproduction project

[bug.zip](https://github.com/godotengine/godot/files/11148287/bug.zip)

update_const_expression_builtin_type(p_return->return_value, expected_type, "return");
			}
			result = p_return->return_value->get_datatype();
		}
	} else {
		
		result.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
		result.kind = GDScriptParser::DataType::BUILTIN;
		result.builtin_type = Variant::NIL;
		result.is_constant = true;
	}
	if (has_expected_type && !expected_type.is_variant()) {
		if (result.is_variant() || !result.is_hard_type()) {
			mark_node_unsafe(p_return);
			if (!is_type_compatible(expected_type, result, true, p_return)) {
				downgrade_node_type_source(p_return);
			}
		} else if (!is_type_compatible(expected_type, result, true, p_return)) {
			mark_node_unsafe(p_return);
			if (!is_type_compatible(result, expected_type)) {
				push_error(vformat(R"(Cannot return value of type "%s" because the function return type is "%s".)", result.to_string(), expected_type.to_string()), p_return);
			}
#ifdef DEBUG_ENABLED
		} else if (expected_type.builtin_type == Variant::INT && result.builtin_type == Variant::FLOAT) {
			parser->push_warning(p_return, GDScriptWarning::NARROWING_CONVERSION);
#endif
		}
	}
	p_return->set_datatype(result);
}