### 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_node && member_node->type != GDScriptParser::Node::ANNOTATION) {
			
			for (GDScriptParser::AnnotationNode *&E : member_node->annotations) {
				if (E->name == SNAME("@warning_ignore")) {
					resolve_annotation(E);
					E->apply(parser, member.variable);
				}
			}
			for (GDScriptWarning::Code ignored_warning : member_node->ignored_warnings) {
				parser->ignored_warnings.insert(ignored_warning);
			}
		}
#endif
		switch (member.type) {
			case GDScriptParser::ClassNode::Member::VARIABLE: {
				bool previous_static_context = static_context;
				static_context = member.variable->is_static;
				check_class_member_name_conflict(p_class, member.variable->identifier->name, member.variable);
				member.variable->set_datatype(resolving_datatype);
				resolve_variable(member.variable, false);
				
				for (GDScriptParser::AnnotationNode *&E : member.variable->annotations) {
					if (E->name != SNAME("@warning_ignore")) {
						resolve_annotation(E);
						E->apply(parser, member.variable);
					}
				}
				static_context = previous_static_context;
#ifdef DEBUG_ENABLED
				if (member.variable->exported && member.variable->onready) {