### 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)

case GDScriptParser::ClassNode::Member::VARIABLE: {
					if (is_base && (!base.is_meta_type || member.variable->is_static)) {
						p_identifier->set_datatype(member.get_datatype());
						p_identifier->source = member.variable->is_static ? GDScriptParser::IdentifierNode::STATIC_VARIABLE : GDScriptParser::IdentifierNode::MEMBER_VARIABLE;
						p_identifier->variable_source = member.variable;
						member.variable->usages += 1;
						return;
					}
				} break;
				case GDScriptParser::ClassNode::Member::SIGNAL: {
					if (is_base && !base.is_meta_type) {
						p_identifier->set_datatype(member.get_datatype());
						p_identifier->source = GDScriptParser::IdentifierNode::MEMBER_SIGNAL;
						return;
					}
				} break;
				case GDScriptParser::ClassNode::Member::FUNCTION: {
					if (is_base && (!base.is_meta_type || member.function->is_static)) {
						p_identifier->set_datatype(make_callable_type(member.function->info));
						return;
					}
				} break;
				case GDScriptParser::ClassNode::Member::CLASS: {
					reduce_identifier_from_base_set_class(p_identifier, member.get_datatype());
					return;
				}
				default: {
					
				}
			}