Original post - see below for the edited version:
I've recently noticed that some questions for which links were added in comments did not appear in the list on the right.
Is this a bug or was the behavior of the list of linked questions changed intentionally? Or is there some delay before the linked question appears? (I did not notice any such delay in the past. IIRC after adding a link in an answer or a comment, after refreshing the page, the link was already in the list of linked questions.)
I did not find anything in recently asked questions tagged linked-question at meta.SO. The tag-wiki still says that the linked questions come from questions that users have linked in the question, their answers, or in comments.
- I've noticed this in the question What do $\gg$ and $\ll$ mean? - the question linked in this comment is not shown in the list. (At least not at this moment. The comment was added 20 mins ago.)
If I stumble upon more examples, I'll add them here.
EDIT: When I've checked the question now (2 hours after the comment was added), the question is in the list. So now my question is basically why is there the delay between adding a comment and adding link to a list. (I wonder whether someone can confirm that this used to be immediate.)