### 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)

if (!list_type.is_hard_type()) {
			mark_node_unsafe(p_for->list);
		}
		if (list_type.is_variant()) {
			variable_type.kind = GDScriptParser::DataType::VARIANT;
			mark_node_unsafe(p_for->list);
		} else if (list_type.has_container_element_type()) {
			variable_type = list_type.get_container_element_type();
			variable_type.type_source = list_type.type_source;
		} else if (list_type.is_typed_container_type()) {
			variable_type = list_type.get_typed_container_type();
			variable_type.type_source = list_type.type_source;
		} else if (list_type.builtin_type == Variant::INT || list_type.builtin_type == Variant::FLOAT || list_type.builtin_type == Variant::STRING) {
			variable_type.type_source = list_type.type_source;
			variable_type.kind = GDScriptParser::DataType::BUILTIN;
			variable_type.builtin_type = list_type.builtin_type;
		} else if (list_type.builtin_type == Variant::VECTOR2I || list_type.builtin_type == Variant::VECTOR3I) {
			variable_type.type_source = list_type.type_source;
			variable_type.kind = GDScriptParser::DataType::BUILTIN;
			variable_type.builtin_type = Variant::INT;
		} else if (list_type.builtin_type == Variant::VECTOR2 || list_type.builtin_type == Variant::VECTOR3) {
			variable_type.type_source = list_type.type_source;
			variable_type.kind = GDScriptParser::DataType::BUILTIN;
			variable_type.builtin_type = Variant::FLOAT;
		} else if (list_type.builtin_type == Variant::OBJECT) {
			GDScriptParser::DataType return_type;
			List<GDScriptParser::DataType> par_types;
			int default_arg_count = 0;
			BitField<MethodFlags> method_flags;
			if (get_function_signature(p_for->list, false, list_type, CoreStringNames::get_singleton()->_iter_get, return_type, par_types, default_arg_count, method_flags)) {