### 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)

bool is_valid = false;
		Variant value = base_value.get(index_value, &is_valid);
		if (is_valid) {
			is_reduced = true;
			return value;
		} else {
			return Variant();
		}
	}
}
Array GDScriptAnalyzer::make_array_from_element_datatype(const GDScriptParser::DataType &p_element_datatype, const GDScriptParser::Node *p_source_node) {
	Array array;
	if (p_element_datatype.builtin_type == Variant::OBJECT) {
		Ref<Script> script_type = p_element_datatype.script_type;
		if (p_element_datatype.kind == GDScriptParser::DataType::CLASS && script_type.is_null()) {
			Error err = OK;
			Ref<GDScript> scr = GDScriptCache::get_shallow_script(p_element_datatype.script_path, err);
			if (err) {
				push_error(vformat(R"(Error while getting cache for script "%s".)", p_element_datatype.script_path), p_source_node);
				return array;
			}
			script_type.reference_ptr(scr->find_class(p_element_datatype.class_type->fqcn));
		}
		array.set_typed(p_element_datatype.builtin_type, p_element_datatype.native_type, script_type);
	} else {
		array.set_typed(p_element_datatype.builtin_type, StringName(), Variant());
	}
	return array;
}
Variant GDScriptAnalyzer::make_variable_default_value(GDScriptParser::VariableNode *p_variable) {