### 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)

if (!p_preload->path) {
		return;
	}
	reduce_expression(p_preload->path);
	if (!p_preload->path->is_constant) {
		push_error("Preloaded path must be a constant string.", p_preload->path);
		return;
	}
	if (p_preload->path->reduced_value.get_type() != Variant::STRING) {
		push_error("Preloaded path must be a constant string.", p_preload->path);
	} else {
		p_preload->resolved_path = p_preload->path->reduced_value;
		
		if (p_preload->resolved_path.is_relative_path()) {
			p_preload->resolved_path = parser->script_path.get_base_dir().path_join(p_preload->resolved_path);
		}
		p_preload->resolved_path = p_preload->resolved_path.simplify_path();
		if (!ResourceLoader::exists(p_preload->resolved_path)) {
			Ref<FileAccess> file_check = FileAccess::create(FileAccess::ACCESS_RESOURCES);
			if (file_check->file_exists(p_preload->resolved_path)) {
				push_error(vformat(R"(Preload file "%s" has no resource loaders (unrecognized file extension).)", p_preload->resolved_path), p_preload->path);
			} else {
				push_error(vformat(R"(Preload file "%s" does not exist.)", p_preload->resolved_path), p_preload->path);
			}
		} else {
			
			
			
			if (ResourceLoader::get_resource_type(p_preload->resolved_path) == "GDScript") {
				Error err = OK;