### 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)

Dictionary dictionary;
	for (int i = 0; i < p_dictionary->elements.size(); i++) {
		const GDScriptParser::DictionaryNode::Pair &element = p_dictionary->elements[i];
		bool is_element_key_reduced = false;
		Variant element_key = make_expression_reduced_value(element.key, is_element_key_reduced);
		if (!is_element_key_reduced) {
			return Variant();
		}
		bool is_element_value_reduced = false;
		Variant element_value = make_expression_reduced_value(element.value, is_element_value_reduced);
		if (!is_element_value_reduced) {
			return Variant();
		}
		dictionary[element_key] = element_value;
	}
	dictionary.make_read_only();
	is_reduced = true;
	return dictionary;
}
Variant GDScriptAnalyzer::make_subscript_reduced_value(GDScriptParser::SubscriptNode *p_subscript, bool &is_reduced) {