### 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::IdentifierNode::UNDEFINED_SOURCE:
			break;
	}
	
	if (!found_source) {
		reduce_identifier_from_base(p_identifier);
		if (p_identifier->source != GDScriptParser::IdentifierNode::UNDEFINED_SOURCE || p_identifier->get_datatype().is_set()) {
			
			found_source = true;
		}
	}
	if (found_source) {
		bool source_is_variable = p_identifier->source == GDScriptParser::IdentifierNode::MEMBER_VARIABLE || p_identifier->source == GDScriptParser::IdentifierNode::INHERITED_VARIABLE;
		bool source_is_signal = p_identifier->source == GDScriptParser::IdentifierNode::MEMBER_SIGNAL;
		if ((source_is_variable || source_is_signal) && static_context) {
			if (parser->current_function) {
				
				GDScriptParser::FunctionNode *parent_function = parser->current_function;
				while (parent_function->source_lambda) {
					parent_function = parent_function->source_lambda->parent_function;
				}
				push_error(vformat(R"*(Cannot access %s "%s" from the static function "%s()".)*", source_is_signal ? "signal" : "instance variable", p_identifier->name, parent_function->identifier->name), p_identifier);
			} else {
				push_error(vformat(R"*(Cannot access %s "%s" for a static variable initializer.)*", source_is_signal ? "signal" : "instance variable", p_identifier->name), p_identifier);
			}
		}
		if (!lambda_stack.is_empty()) {
			
			if (source_is_variable || source_is_signal) {
				mark_lambda_use_self();