### 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
p_node->end_line = previous.end_line;
	p_node->end_column = previous.end_column;
	p_node->leftmost_column = MIN(p_node->leftmost_column, previous.leftmost_column);
	p_node->rightmost_column = MAX(p_node->rightmost_column, previous.rightmost_column);
}
void GDScriptParser::reset_extents(Node *p_node, GDScriptTokenizer::Token p_token) {
	p_node->start_line = p_token.start_line;
	p_node->end_line = p_token.end_line;
	p_node->start_column = p_token.start_column;
	p_node->end_column = p_token.end_column;
	p_node->leftmost_column = p_token.leftmost_column;
	p_node->rightmost_column = p_token.rightmost_column;
}
void GDScriptParser::reset_extents(Node *p_node, Node *p_from) {
	if (p_from == nullptr) {
		return;
	}
	p_node->start_line = p_from->start_line;
	p_node->end_line = p_from->end_line;
	p_node->start_column = p_from->start_column;
	p_node->end_column = p_from->end_column;
	p_node->leftmost_column = p_from->leftmost_column;
	p_node->rightmost_column = p_from->rightmost_column;
}
#ifdef DEBUG_ENABLED
void GDScriptParser::TreePrinter::increase_indent() {