Changing The Title Of A Thread

I was trying to fix a typo in a thread title (one which was not started by myself) by replacing a single letter. Discourse was convinced that the title I was trying to save already existed, therefore not saving the new version. Is there a minimum amount of letters that need changing in such a case?

I’m not sure, what what the original title and url and the desired new title?

That’s here MapRoulette challanges. Just changing an “a” for an “e” in challenges.

The problem is that there is already a topic with the same name

Try to add something else so the title is unique.