With 0.18.2, 0.18.3 there were changes in the behavior of comment sorting and delete / remove behavior. It is entirely possible that behavior changed, intentional or otherwise.
There is a !test@lemmy.ml community where you could create comments, do some screen shots before and after delete.
I have, weeks ago.
I did share a link to GitHub, is that not good enough or something? Here is a screen shot for you.