As mentioned in a post by jay9519 via the discussion forum, there was an issue where renaming an elevator to be blank in an anvil would result in the anvil giving an empty shulkerbox. This update deals with the problem by setting the result of the anvil to a fresh elevator with the custom name.

Please notify me of any issues you might have with this update via DM's or on the forum discussion Thank you all for consistently helping me improve this plugin