I have seen quite some posts about the duplicate search being broken, and I had like to do another report which really hurts users trying to find duplicates.
I try to find a post using the exact title I have seen somewhere else (or very well known canonical questions). I type that question title exactly in the search box:
It can't find it, while it is obviously there, literally. Instead it gives a bunch of unrelated posts.
Luckily Google knows where to find that post:
So now I can copy the link and close the question.