Unlisting a thread breaks links that have old thread names

[fefrei (Felix Freiberger)]

I’m pretty sure this was introduced intentionally, to ensure that the URLs of unlisted topics cannot be guessed by enumerating IDs.

Update: Ah, found it:

Mod can't see unlisted posts

This is my regression which I will get fixed, it is due to: https://github.com/discourse/discourse/commit/3015030fe21a120f42aadcdd14e84cb3e964f873 In the past we used to run all requests to unlisted topics via the “auto correct slug” logic, this was a security hole allowing users to simply guess the URL of unlisted topics. Now we expect the slug to match exactly for unlisted stuff. Somehow clicks from the front page are relying on the redirect logic, which is a performance issue anyway. work…