### 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)

GDScriptParser::DataType bad_type;
	bad_type.kind = GDScriptParser::DataType::VARIANT;
	bad_type.type_source = GDScriptParser::DataType::INFERRED;
	if (p_type == nullptr) {
		return bad_type;
	}
	if (p_type->get_datatype().is_resolving()) {
		push_error(R"(Could not resolve datatype: Cyclic reference.)", p_type);
		return bad_type;
	}
	if (!p_type->get_datatype().has_no_type()) {
		return p_type->get_datatype();
	}
	GDScriptParser::DataType resolving_datatype;
	resolving_datatype.kind = GDScriptParser::DataType::RESOLVING;
	p_type->set_datatype(resolving_datatype);
	GDScriptParser::DataType result;
	result.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
	if (p_type->type_chain.is_empty()) {
		
		result.kind = GDScriptParser::DataType::BUILTIN;
		result.builtin_type = Variant::NIL;