For info, itâs not the fact that you edited the reply - I did that with one of mine here and who I replied to is visible along with the fact that I edited it.
My guess** is that perhaps Discourse doesnât show you who you replied to if that reply is currently the most recent in the thread, even if you explicitly chose to reply to a post, not reply generally to the thread?
There are plenty of other examples where ânanny Discourseâ doesnât let you quote text the way you want to, or use the characters in your reply that you want to.
Edit: ** yes - it looks like that. Here I explicitly replied to a post, but Discourse has removed that information.