### 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 (member.variable->setter->parameters.size() > 0) {
						member.variable->setter->parameters[0]->datatype_specifier = member.variable->datatype_specifier;
						member.variable->setter->parameters[0]->set_datatype(member.get_datatype());
					}
					resolve_function_body(member.variable->setter);
				}
			}
		} else if (member.type == GDScriptParser::ClassNode::Member::GROUP) {
			
			resolve_annotation(member.annotation);
			member.annotation->apply(parser, nullptr);
		}
	}
	
	for (int i = 0; i < p_class->members.size(); i++) {
		GDScriptParser::ClassNode::Member member = p_class->members[i];
		if (member.type == GDScriptParser::ClassNode::Member::VARIABLE) {
#ifdef DEBUG_ENABLED
			HashSet<GDScriptWarning::Code> previously_ignored_warnings = parser->ignored_warnings;
			for (GDScriptWarning::Code ignored_warning : member.variable->ignored_warnings) {
				parser->ignored_warnings.insert(ignored_warning);
			}
			if (member.variable->usages == 0 && String(member.variable->identifier->name).begins_with("_")) {
				parser->push_warning(member.variable->identifier, GDScriptWarning::UNUSED_PRIVATE_CLASS_VARIABLE, member.variable->identifier->name);
			}
#endif
			if (member.variable->property == GDScriptParser::VariableNode::PROP_SETGET) {
				GDScriptParser::FunctionNode *getter_function = nullptr;
				GDScriptParser::FunctionNode *setter_function = nullptr;
				bool has_valid_getter = false;