After v2.5, why is there div with class "admin-hidden-markup" for hidden fields?

I just upgraded from v2.4.x to v2.5.7. Why is there a div with class “admin-hidden-markup” for hidden fields after v2.5? I have to add a custom CSS “display: none” to the class to hide it.

<div class="admin-hidden-markup">
  <i class="gform-icon gform-icon--hidden"></i>

If you believe this is a bug please report it here:

Did you ever get this resolved? Dealing with the same issue.

I recommend opening a support ticket if you are seeing this issue. Thank you.