### 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_assignable->initializer != nullptr) {
		reduce_expression(p_assignable->initializer);
		if (p_assignable->initializer->type == GDScriptParser::Node::ARRAY) {
			GDScriptParser::ArrayNode *array = static_cast<GDScriptParser::ArrayNode *>(p_assignable->initializer);
			if (has_specified_type && specified_type.has_container_element_type()) {
				update_array_literal_element_type(array, specified_type.get_container_element_type());
			}
		}
		if (is_constant && !p_assignable->initializer->is_constant) {
			bool is_initializer_value_reduced = false;
			Variant initializer_value = make_expression_reduced_value(p_assignable->initializer, is_initializer_value_reduced);
			if (is_initializer_value_reduced) {
				p_assignable->initializer->is_constant = true;
				p_assignable->initializer->reduced_value = initializer_value;
			} else {
				push_error(vformat(R"(Assigned value for %s "%s" isn't a constant expression.)", p_kind, p_assignable->identifier->name), p_assignable->initializer);
			}
		}
		if (has_specified_type && p_assignable->initializer->is_constant) {
			update_const_expression_builtin_type(p_assignable->initializer, specified_type, "assign");
		}
		GDScriptParser::DataType initializer_type = p_assignable->initializer->get_datatype();
		if (p_assignable->infer_datatype) {
			if (!initializer_type.is_set() || initializer_type.has_no_type() || !initializer_type.is_hard_type()) {
				push_error(vformat(R"(Cannot infer the type of "%s" %s because the value doesn't have a set type.)", p_assignable->identifier->name, p_kind), p_assignable->initializer);
			} else if (initializer_type.kind == GDScriptParser::DataType::BUILTIN && initializer_type.builtin_type == Variant::NIL && !is_constant) {
				push_error(vformat(R"(Cannot infer the type of "%s" %s because the value is "null".)", p_assignable->identifier->name, p_kind), p_assignable->initializer);
			}
#ifdef DEBUG_ENABLED
			if (initializer_type.is_hard_type() && initializer_type.is_variant()) {