### Godot version

v4.0.beta17.official [c40020513]

### System information

Apple M1 Max - macOS Ventura 13.1 (22C65)

### Issue description

I am getting an error due to functions no longer returning the correct typed array, when the function concatenates arrays and returns it.

In other words, the following fails:

```
func add_arrays() -> Array[ClassA]:
	var array_1: Array[ClassA] = []
	var array_2: Array[ClassA] = []
	return array_1 + array_2
```

<img width="864" alt="Screenshot 2023-02-02 at 1 02 53 PM" src="https://user-images.githubusercontent.com/905216/216320503-475bf4a1-353e-455c-87d5-69d036db706c.png">

I'm assuming when concatenating, the typing changes to a generic `Array` now? Just a guess. 

### Steps to reproduce

N/A

### Minimal reproduction project

[Godot Crash Project.zip](https://github.com/godotengine/godot/files/10568780/Godot.Crash.Project.zip)

result = make_script_meta_type(ResourceLoader::load(path, "Script"));
			}
		}
	} else if (ProjectSettings::get_singleton()->has_autoload(first) && ProjectSettings::get_singleton()->get_autoload(first).is_singleton) {
		const ProjectSettings::AutoloadInfo &autoload = ProjectSettings::get_singleton()->get_autoload(first);
		Ref<GDScriptParserRef> ref = get_parser_for(autoload.path);
		if (ref.is_null()) {
			push_error(vformat(R"(The referenced autoload "%s" (from "%s") could not be loaded.)", first, autoload.path), p_type);
			return bad_type;
		}
		if (ref->raise_status(GDScriptParserRef::INHERITANCE_SOLVED) != OK) {
			push_error(vformat(R"(Could not parse singleton "%s" from "%s".)", first, autoload.path), p_type);
			return bad_type;
		}
		result = ref->get_parser()->head->get_datatype();
	} else if (ClassDB::has_enum(parser->current_class->base_type.native_type, first)) {
		
		result = make_native_enum_type(first, parser->current_class->base_type.native_type);
	} else if (CoreConstants::is_global_enum(first)) {
		if (p_type->type_chain.size() > 1) {
			push_error(R"(Enums cannot contain nested types.)", p_type->type_chain[1]);
			return bad_type;
		}
		result = make_global_enum_type(first, StringName());
	} else {
		
		List<GDScriptParser::ClassNode *> script_classes;
		bool found = false;
		get_class_node_current_scope_classes(parser->current_class, &script_classes);
		for (GDScriptParser::ClassNode *script_class : script_classes) {