I have a custom field named Flagged that is not editable on the New Issue View screen.
When I create a new issue or move the issue between statuses the field correctly appears and the checkbox options can be edited individually as seen in the screenshot below:

However on the New Issue View screen all I see is a generic Flagged icon without the ability to individually edit the options:

For reference here is a screenshot of how I could edit these fields in the old layout:
