Knoxtane Correct, my bad. I have looked into the CSS, and it appears that the justoverclock-edit-posts
extension is incompatible with the FA 6 extension. Disabling it fixed it.
Alternatively, you can enable it and use the following CSS to make the reply button display correctly:
.Post-actions .Button--link::before {
font-family: 'Font Awesome 6 Free' !important;
}
I have reported the bug to the extension author here: https://github.com/justoverclockl/edit-posts/issues/2