Hey there, sorry for the delay in response! The latest update added the ability to edit your post, which replaces the "reply" action on the action bar.
To reply to your own post, you can use the associated FAB actions (if enabled in the settings). If you have any other suggestions, feel free to open up a new issue on GitHub!
As far as I can tell, I’m not having that issue. I’m on the latest TestFlight version on iOS, which I think is the same as the AppStore release at the moment.