### Godot version

v4.0.beta13.official [caacade56]

### System information

Windows 8.1

### Issue description

The `Unreachable code (statement after return) in function 'function_name()'` warning is given for functions that do not have unreachable code. The same code does not give this warning in v3.5.stable.official [991bb6ac7].

### Steps to reproduce

```
func warning(i: int) -> void:
  if i == 0:
    pass
  elif i == 1:
    return
  else:
    return
  print("yeah")
```

Removing either the `elif` or the `else` removes the warning.

### Minimal reproduction project

N/A; code in reproduction steps can be placed in any blank gdscript file to trigger the error.
} else if (head->has_member(first)) {
		class_names = p_qualified_name.split("::");
		GDScriptParser::ClassNode::Member member = head->get_member(first);
		if (member.type == GDScriptParser::ClassNode::Member::CLASS) {
			result = member.m_class;
		}
	}
	
	for (int i = 1; result != nullptr && i < class_names.size(); i++) {
		String current_name = class_names[i];
		GDScriptParser::ClassNode *next = nullptr;
		if (result->has_member(current_name)) {
			GDScriptParser::ClassNode::Member member = result->get_member(current_name);
			if (member.type == GDScriptParser::ClassNode::Member::CLASS) {
				next = member.m_class;
			}
		}
		result = next;
	}
	return result;
}
bool GDScriptParser::has_class(const GDScriptParser::ClassNode *p_class) const {
	if (head->fqcn.is_empty() && p_class->fqcn.get_slice("::", 0).is_empty()) {
		return p_class == head;
	} else if (p_class->fqcn.begins_with(head->fqcn)) {
		return find_class(p_class->fqcn.trim_prefix(head->fqcn)) == p_class;
	}
	return false;
}
GDScriptParser::ClassNode *GDScriptParser::parse_class() {