### 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
switch (kind) {
		case VARIANT:
			return "Variant";
		case BUILTIN:
			if (builtin_type == Variant::NIL) {
				return "null";
			}
			if (builtin_type == Variant::ARRAY && has_container_element_type()) {
				return vformat("Array[%s]", container_element_type->to_string());
			}
			return Variant::get_type_name(builtin_type);
		case NATIVE:
			if (is_meta_type) {
				return GDScriptNativeClass::get_class_static();
			}
			return native_type.operator String();
		case CLASS:
			if (is_meta_type) {
				return GDScript::get_class_static();
			}