### 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)

for (int i = 0; i < p_match_branch->patterns.size(); i++) {
		resolve_match_pattern(p_match_branch->patterns[i], p_match_test);
	}
	resolve_suite(p_match_branch->block);
	decide_suite_type(p_match_branch, p_match_branch->block);
}
void GDScriptAnalyzer::resolve_match_pattern(GDScriptParser::PatternNode *p_match_pattern, GDScriptParser::ExpressionNode *p_match_test) {
	if (p_match_pattern == nullptr) {
		return;
	}
	GDScriptParser::DataType result;
	switch (p_match_pattern->pattern_type) {
		case GDScriptParser::PatternNode::PT_LITERAL:
			if (p_match_pattern->literal) {
				reduce_literal(p_match_pattern->literal);
				result = p_match_pattern->literal->get_datatype();
			}
			break;
		case GDScriptParser::PatternNode::PT_EXPRESSION:
			if (p_match_pattern->expression) {
				GDScriptParser::ExpressionNode *expr = p_match_pattern->expression;
				reduce_expression(expr);
				result = expr->get_datatype();
				if (!expr->is_constant) {
					while (expr && expr->type == GDScriptParser::Node::SUBSCRIPT) {
						GDScriptParser::SubscriptNode *sub = static_cast<GDScriptParser::SubscriptNode *>(expr);
						if (!sub->is_attribute) {
							expr = nullptr;
						} else {