comment submit buttons disabled in bootstrap

Bootstrap 7.x-3.0

Both comment form buttons are disabled until text is provided for the main comment form.

Screen shot 1: shows that both buttons are disabled even though there is text in the reply form.

Screen shot 2: once text is added to the main comment form, all buttons are enabled.

Here is the rendered html for the submit button (for the reply form) when it's disabled:

<button class="btn-sm btn-primary btn btn-success form-submit form-disabled" id="edit-submit--2" name="op" value="Add Comment" type="submit" disabled="disabled">
  Add Comment
</button>

A similar issue with the statuses module: https://www.drupal.org/node/2086739

My quick fix was simply setting the "disabled" property for the buttons to false :

$( ".comment-form-region form button" ).prop('disabled', false);

$( ".comment-display-region form button" ).prop('disabled', false);

It would be great if there was a cleaner fix within the module itself.