I’m not 100% sure if this is a bug or intended behaviour, but our users are confused by it: there is an inconsistency in the ‘reply to post’ function (I mean the ‘in post’ grey reply button): in the following two cases, a reply won’t be ‘linked’ to the post:
When replying to the original post
When replying to the most recent post
In the second case I can see the point as the posts are physically next to each other (although I still prefer consistency). In the first case it’s hard to see which post was replied to.
The logic here is a little quirky. If there’s no reply-to-indicator, then it’s either a reply to the post immediately above it, or it’s a reply to the OP.
The problem with this is that this is impossible to ‘discover’ for users. I think it would be more consistent and easier to understand if the link was displayed everywhere.