### 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)

}
		return;
	}
	p_class->resolved_body = true;
	GDScriptParser::ClassNode *previous_class = parser->current_class;
	parser->current_class = p_class;
	resolve_class_interface(p_class, p_source);
	GDScriptParser::DataType base_type = p_class->base_type;
	if (base_type.kind == GDScriptParser::DataType::CLASS) {
		GDScriptParser::ClassNode *base_class = base_type.class_type;
		resolve_class_body(base_class, p_class);
	}
	
	for (int i = 0; i < p_class->members.size(); i++) {
		GDScriptParser::ClassNode::Member member = p_class->members[i];
		if (member.type == GDScriptParser::ClassNode::Member::FUNCTION) {
			
			for (GDScriptParser::AnnotationNode *&E : member.function->annotations) {
				resolve_annotation(E);
				E->apply(parser, member.function);
			}
			resolve_function_body(member.function);
		} else if (member.type == GDScriptParser::ClassNode::Member::VARIABLE && member.variable->property != GDScriptParser::VariableNode::PROP_NONE) {
			if (member.variable->property == GDScriptParser::VariableNode::PROP_INLINE) {
				if (member.variable->getter != nullptr) {
					member.variable->getter->set_datatype(member.variable->datatype);
					resolve_function_body(member.variable->getter);
				}
				if (member.variable->setter != nullptr) {
					resolve_function_signature(member.variable->setter);