brother it is said that essay paper is a mass murderer. but the examiner who is checking these papers must be someone to fail so many candidates. but i do not think that he will be so brutal to fail someone just because an essay topic was a typo. brother the probability of failure of those candidates who attempted a correct topic is same as you. it might even be that examiner generates a soft corner for those who attempted the wrong topic. so if even if no one has any information, think positive, the result is now not in your hands, forget about it and begin preparing for the next one.

regards