### 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;
		}
		String doc_line = comments[line].comment.trim_prefix("##");
		in_codeblock = _in_codeblock(doc_line, in_codeblock, &codeblock_begins);
		if (in_codeblock) {
			int i = 0;
			for (; i < codeblock_begins; i++) {
				if (doc_line[i] != ' ') {
					break;
				}
			}
			doc_line = doc_line.substr(i);
		} else {
			doc_line = doc_line.strip_edges();
		}
		String line_join = (in_codeblock) ? "\n" : " ";
		doc = (doc.is_empty()) ? doc_line : doc + line_join + doc_line;
		line++;
	}
	return doc;
}
void GDScriptParser::get_class_doc_comment(int p_line, String &p_brief, String &p_desc, Vector<Pair<String, String>> &p_tutorials, bool p_inner_class) {
	const HashMap<int, GDScriptTokenizer::CommentData> &comments = tokenizer.get_comments();
	if (!comments.has(p_line)) {
		return;
	}
	ERR_FAIL_COND(!p_brief.is_empty() || !p_desc.is_empty() || p_tutorials.size() != 0);
	int line = p_line;
	bool in_codeblock = false;
	enum Mode {