### Godot version

4.1.rc.custom_build. c83f912bc

### System information

Ubuntu 22.04 CI

### Issue description

When executing
```
extends Node
func _process(delta):

	var temp_variable35241 = RichTextLabel.new()
	add_child(temp_variable35241)
	temp_variable35241.set_fit_content(true)
	temp_variable35241.parse_bbcode("3188932498")
	temp_variable35241.queue_free()
```
this code freeze project in CI for at least 60 seconds

### Steps to reproduce

Above

### Minimal reproduction project

N/A
if (st_parser != p_parser) {
		_stop_thread();
		st_parser = p_parser;
		main->first_invalid_line.store(0); 
		_validate_line_caches();
		queue_redraw();
	}
}
TextServer::StructuredTextParser RichTextLabel::get_structured_text_bidi_override() const {
	return st_parser;
}
void RichTextLabel::set_structured_text_bidi_override_options(Array p_args) {
	if (st_args != p_args) {
		_stop_thread();
		st_args = p_args;
		main->first_invalid_line.store(0); 
		_validate_line_caches();
		queue_redraw();
	}
}
Array RichTextLabel::get_structured_text_bidi_override_options() const {