Can use these 2 actions, it will be similar when you want to end the thread.
But in this case, this is a bug with the site. So you can use Fail to give an error message. This action will end the current thread.
Screenshot_4.png
this bug exist at least from 1 year ago, this make the website can easily detect this as a bot, but somehow dev dont fix it till now. very unfortunate case, if we see so many new feature being introduced yet the basic need is being forgotten/not maintained