We've just observed on The Heap the following:
That is, there is no mention of the author of the original post. However, he got a notification about the answer and the arrow points to the correct entry.
Here is how to reproduce the thing: simply post an answer with a soft carriage return in it. The new line must contain at least one non-whitespace character.
Well, I see this is a minor bug - but still a bug (buglet if there's anything like that :)
Credit goes to Andriy M who discovered it and Mikael Eriksson who showed how to reproduce.