CustomModelData set for close button breaks the functionality

I am utilizing (which are latest as of writing this):

• QSFindItemAddOn-2.0.5.2-RELEASE
• QuickShop-Hikari-5.2.0.5.jar

When I set custom-model-data for back, next, and close the appearance works as expected. The "back" and "next" buttons work as expected. However when I try to use the "close" button, it provides this error:

[QSFindItemAddOn] PersistentDataContainer doesn't have the right kind of data!

Changing the "close" button back to Barrier with no custom-model-data resolves this error. I have attempted deleted both of the folders of QuickShop & QSFindItemAddOn to generate fresh versions, and changed only the model data, and issue remains. I have also done full restarts of server instead of reload.

Unrelated, but having the "filler-item" be able to utilize custom-model-data would be nice.