### 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;
				}
				decided_style = true;
			}
			switch (dictionary->style) {
				case DictionaryNode::LUA_TABLE:
					if (key != nullptr && key->type != Node::IDENTIFIER && key->type != Node::LITERAL) {
						push_error("Expected identifier or string as LUA-style dictionary key.");
						advance();
						break;
					}
					if (key != nullptr && key->type == Node::LITERAL && static_cast<LiteralNode *>(key)->value.get_type() != Variant::STRING) {
						push_error("Expected identifier or string as LUA-style dictionary key.");
						advance();
						break;
					}
					if (!match(GDScriptTokenizer::Token::EQUAL)) {
						if (match(GDScriptTokenizer::Token::COLON)) {
							push_error(R"(Expected "=" after dictionary key. Mixing dictionary styles is not allowed.)");
							advance(); 
						} else {
							push_error(R"(Expected "=" after dictionary key.)");
						}
					}
					if (key != nullptr) {
						key->is_constant = true;
						if (key->type == Node::IDENTIFIER) {
							key->reduced_value = static_cast<IdentifierNode *>(key)->name;
						} else if (key->type == Node::LITERAL) {
							key->reduced_value = StringName(static_cast<LiteralNode *>(key)->value.operator String());