This is a minor bug, but it has been irritating me long enough to finally file a bug report.
When I like a post and then click “Reply” on that post, the editor does not open. I click “Reply” again, and now it opens. This doesn’t happen everytime I try the combination, but often enough to be irritating.
Maybe a timing issue - if the AJAX call from the “like” action hasn’t returned yet, the “Reply” click is silently dropped?