### 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
operation->operation = BinaryOpNode::OP_ADDITION;
			operation->variant_op = Variant::OP_ADD;
			break;
		case GDScriptTokenizer::Token::MINUS:
			operation->operation = BinaryOpNode::OP_SUBTRACTION;
			operation->variant_op = Variant::OP_SUBTRACT;
			break;
		case GDScriptTokenizer::Token::STAR:
			operation->operation = BinaryOpNode::OP_MULTIPLICATION;
			operation->variant_op = Variant::OP_MULTIPLY;
			break;
		case GDScriptTokenizer::Token::SLASH:
			operation->operation = BinaryOpNode::OP_DIVISION;
			operation->variant_op = Variant::OP_DIVIDE;
			break;
		case GDScriptTokenizer::Token::PERCENT:
			operation->operation = BinaryOpNode::OP_MODULO;
			operation->variant_op = Variant::OP_MODULE;
			break;
		case GDScriptTokenizer::Token::STAR_STAR:
			operation->operation = BinaryOpNode::OP_POWER;
			operation->variant_op = Variant::OP_POWER;
			break;
		case GDScriptTokenizer::Token::LESS_LESS:
			operation->operation = BinaryOpNode::OP_BIT_LEFT_SHIFT;
			operation->variant_op = Variant::OP_SHIFT_LEFT;
			break;
		case GDScriptTokenizer::Token::GREATER_GREATER:
			operation->operation = BinaryOpNode::OP_BIT_RIGHT_SHIFT;
			operation->variant_op = Variant::OP_SHIFT_RIGHT;