### 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 (node != nullptr) {
						Ref<GDScript> scr = node->get_script();
						if (scr.is_valid()) {
							Ref<GDScriptParserRef> singl_parser = get_parser_for(scr->get_script_path());
							if (singl_parser.is_valid()) {
								Error err = singl_parser->raise_status(GDScriptParserRef::INHERITANCE_SOLVED);
								if (err == OK) {
									result = type_from_metatype(singl_parser->get_parser()->head->get_datatype());
								}
							}
						}
					}
				}
			}
			result.is_constant = true;
			p_identifier->set_datatype(result);
			return;
		}
	}
	if (CoreConstants::is_global_constant(name)) {
		int index = CoreConstants::get_global_constant_index(name);
		StringName enum_name = CoreConstants::get_global_constant_enum(index);
		int64_t value = CoreConstants::get_global_constant_value(index);
		if (enum_name != StringName()) {
			p_identifier->set_datatype(make_global_enum_type(enum_name, StringName(), false));
		} else {
			p_identifier->set_datatype(type_from_variant(value, p_identifier));
		}
		p_identifier->is_constant = true;
		p_identifier->reduced_value = value;