### 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 (found) {
				break;
			}
			if (script_class->identifier && script_class->identifier->name == first) {
				result = script_class->get_datatype();
				break;
			}
			if (script_class->members_indices.has(first)) {
				resolve_class_member(script_class, first, p_type);
				GDScriptParser::ClassNode::Member member = script_class->get_member(first);
				switch (member.type) {
					case GDScriptParser::ClassNode::Member::CLASS:
						result = member.get_datatype();
						found = true;
						break;
					case GDScriptParser::ClassNode::Member::ENUM:
						result = member.get_datatype();
						found = true;
						break;
					case GDScriptParser::ClassNode::Member::CONSTANT:
						if (member.get_datatype().is_meta_type) {
							result = member.get_datatype();
							found = true;
							break;
						} else if (Ref<Script>(member.constant->initializer->reduced_value).is_valid()) {
							Ref<GDScript> gdscript = member.constant->initializer->reduced_value;
							if (gdscript.is_valid()) {
								Ref<GDScriptParserRef> ref = get_parser_for(gdscript->get_script_path());
								if (ref->raise_status(GDScriptParserRef::INHERITANCE_SOLVED) != OK) {
									push_error(vformat(R"(Could not parse script from "%s".)", gdscript->get_script_path()), p_type);