In the latest beta version (18.104.22.168) I just noticed the Reply option no longer exists for comments:
If this is a bug, can this please be fixed? Otherwise, can it please be added back? I became quite used to it, being a useful shortcut.
This was purposefully removed during a refactor, as it was introduced as a beta-only feature, and at the time it seemed that the mentions feature would replace it. (The mentions feature helps you autocomplete a user's name when you type @ in the comment).
After some discussion, we decided to put it back, since it was also available in Android. The feature will be back in beta version 22.214.171.124.