### 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.
case GDScriptTokenizer::Token::CONST:
				parse_class_member(&GDScriptParser::parse_constant, AnnotationInfo::CONSTANT, "constant");
				break;
			case GDScriptTokenizer::Token::SIGNAL:
				parse_class_member(&GDScriptParser::parse_signal, AnnotationInfo::SIGNAL, "signal");
				break;
			case GDScriptTokenizer::Token::STATIC:
			case GDScriptTokenizer::Token::FUNC:
				parse_class_member(&GDScriptParser::parse_function, AnnotationInfo::FUNCTION, "function");
				break;
			case GDScriptTokenizer::Token::CLASS:
				parse_class_member(&GDScriptParser::parse_class, AnnotationInfo::CLASS, "class");
				break;
			case GDScriptTokenizer::Token::ENUM:
				parse_class_member(&GDScriptParser::parse_enum, AnnotationInfo::NONE, "enum");
				break;
			case GDScriptTokenizer::Token::ANNOTATION: {
				advance();
				
				AnnotationNode *annotation = parse_annotation(AnnotationInfo::STANDALONE | AnnotationInfo::CLASS_LEVEL);
				if (annotation != nullptr) {
					if (annotation->applies_to(AnnotationInfo::STANDALONE)) {
						if (previous.type != GDScriptTokenizer::Token::NEWLINE) {
							push_error(R"(Expected newline after a standalone annotation.)");
						}
						if (annotation->name == SNAME("@export_category") || annotation->name == SNAME("@export_group") || annotation->name == SNAME("@export_subgroup")) {
							current_class->add_member_group(annotation);
						} else {
							
							push_error(R"(Unexpected standalone annotation in class body.)");