Submission form hierarchical tree view has two add buttons, one enabled and the other disabled

[aseyedia]

Describe the bug

The tree view in the submission form renders two "Add" buttons, one enabled and the other disabled. I'm guessing it's supposed to be one disabled button when the field is empty and the button is later enabled when the field has a query or entry in it.

To Reproduce

Steps to reproduce the behavior:

1. Open the Submission Form Hierarchical Tree View

Expected behavior

I think the "Add" button should be greyed out when no selection is in the field and active when there is.