### 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)

for (int i = 0; i < p_array->elements.size(); i++) {
		GDScriptParser::ExpressionNode *element_node = p_array->elements[i];
		if (element_node->is_constant) {
			update_const_expression_builtin_type(element_node, p_element_type, "include");
		}
		const GDScriptParser::DataType &element_type = element_node->get_datatype();
		if (element_type.has_no_type() || element_type.is_variant() || !element_type.is_hard_type()) {
			mark_node_unsafe(element_node);
			continue;
		}
		if (!is_type_compatible(p_element_type, element_type, true, p_array)) {
			if (is_type_compatible(element_type, p_element_type)) {
				mark_node_unsafe(element_node);
				continue;
			}
			push_error(vformat(R"(Cannot have an element of type "%s" in an array of type "Array[%s]".)", element_type.to_string(), p_element_type.to_string()), element_node);
			return;
		}
	}
	GDScriptParser::DataType array_type = p_array->get_datatype();
	array_type.set_container_element_type(p_element_type);
	p_array->set_datatype(array_type);
}
void GDScriptAnalyzer::reduce_assignment(GDScriptParser::AssignmentNode *p_assignment) {