### Godot version

v4.0.beta14.official [28a24639c]

### System information

MacOS 12.6.2

### Issue description

Beta 14 throws an error for custom `@icon`, e.g.
```
class_name StateMachine extends Node

@icon("res://assets/icons/state_machine.svg")
```
> Annotation "`@icon`" is not allowed in this level.

In beta 13 and before that worked fine.

### Steps to reproduce

1. Add a custom `@icon` in a custom node script.
2. Error message: Annotation "`@icon`" is not allowed in this level.

There are possibly other errors because a `class_name` node is now not recognized if extended by other classes, but they should resolve if `@icon` is removed.

### Minimal reproduction project

N/A
break;
		case GDScriptTokenizer::Token::WHILE:
			advance();
			result = parse_while();
			break;
		case GDScriptTokenizer::Token::MATCH:
			advance();
			result = parse_match();
			break;
		case GDScriptTokenizer::Token::BREAK:
			advance();
			result = parse_break();
			break;
		case GDScriptTokenizer::Token::CONTINUE:
			advance();
			result = parse_continue();
			break;
		case GDScriptTokenizer::Token::RETURN: {
			advance();
			ReturnNode *n_return = alloc_node<ReturnNode>();
			if (!is_statement_end()) {
				if (current_function && current_function->identifier->name == GDScriptLanguage::get_singleton()->strings._init) {
					push_error(R"(Constructor cannot return a value.)");
				}
				n_return->return_value = parse_expression(false);
			} else if (in_lambda && !is_statement_end_token()) {
				
				
				n_return->return_value = parse_expression(false);
			}