Thanks @Thierry_Trégaro! That “Comments” heading is new and intended to make replies feel a bit more like the comments section of a blog post.
It should not have been displaying in a normal topic like the one you shared in your screenshot. I have made a fix for that (and fixed a few other minor styling issues at the same time).
Please go ahead and update the component.
If after updating you want to hide the “Comments” heading for actual blog posts too, go ahead and add the following to a separate component:
.comments-heading {
display: none !important;
}