### 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
push_text("Self(");
	if (p_self->current_class->identifier != nullptr) {
		print_identifier(p_self->current_class->identifier);
	} else {
		push_text("<main class>");
	}
	push_text(")");
}
void GDScriptParser::TreePrinter::print_signal(SignalNode *p_signal) {
	push_text("Signal ");
	print_identifier(p_signal->identifier);
	push_text("( ");
	for (int i = 0; i < p_signal->parameters.size(); i++) {
		print_parameter(p_signal->parameters[i]);
	}
	push_line(" )");
}
void GDScriptParser::TreePrinter::print_subscript(SubscriptNode *p_subscript) {
	print_expression(p_subscript->base);
	if (p_subscript->is_attribute) {
		push_text(".");
		print_identifier(p_subscript->attribute);
	} else {
		push_text("[ ");
		print_expression(p_subscript->index);
		push_text(" ]");
	}
}
void GDScriptParser::TreePrinter::print_statement(Node *p_statement) {