### 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)

reduced = Vector2i(args[0], args[1]);
								break;
							case 3:
								reduced = Vector3i(args[0], args[1], args[2]);
								break;
						}
						p_for->list->is_constant = true;
						p_for->list->reduced_value = reduced;
					}
				}
				if (p_for->list->is_constant) {
					p_for->list->set_datatype(type_from_variant(p_for->list->reduced_value, p_for->list));
				} else {
					GDScriptParser::DataType list_type;
					list_type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
					list_type.kind = GDScriptParser::DataType::BUILTIN;
					list_type.builtin_type = Variant::ARRAY;
					p_for->list->set_datatype(list_type);
				}
			}
		}
	}
	GDScriptParser::DataType variable_type;
	if (list_resolved) {
		variable_type.type_source = GDScriptParser::DataType::ANNOTATED_INFERRED;
		variable_type.kind = GDScriptParser::DataType::BUILTIN;
		variable_type.builtin_type = Variant::INT;
	} else if (p_for->list) {
		resolve_node(p_for->list, false);
		GDScriptParser::DataType list_type = p_for->list->get_datatype();