### 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)

variable_type = return_type;
				variable_type.type_source = list_type.type_source;
			} else if (!list_type.is_hard_type()) {
				variable_type.kind = GDScriptParser::DataType::VARIANT;
			} else {
				push_error(vformat(R"(Unable to iterate on object of type "%s".)", list_type.to_string()), p_for->list);
			}
		} else if (list_type.builtin_type == Variant::ARRAY || list_type.builtin_type == Variant::DICTIONARY || !list_type.is_hard_type()) {
			variable_type.kind = GDScriptParser::DataType::VARIANT;
		} else {
			push_error(vformat(R"(Unable to iterate on value of type "%s".)", list_type.to_string()), p_for->list);
		}
	}
	if (p_for->variable) {
		p_for->variable->set_datatype(variable_type);
	}
	resolve_suite(p_for->loop);
	p_for->set_datatype(p_for->loop->get_datatype());
#ifdef DEBUG_ENABLED
	if (p_for->variable) {
		is_shadowing(p_for->variable, R"("for" iterator variable)");
	}
#endif
}
void GDScriptAnalyzer::resolve_while(GDScriptParser::WhileNode *p_while) {
	resolve_node(p_while->condition, false);
	resolve_suite(p_while->loop);
	p_while->set_datatype(p_while->loop->get_datatype());
}
void GDScriptAnalyzer::resolve_assert(GDScriptParser::AssertNode *p_assert) {