Checkbox defect when using visual builder

I created a sales order (transaction) workflow that checks whether a checkbox on the customer record is checked or not and removes the APPROVE button based on what it finds.

If the checkbox on the customer record is unchecked, then the workflow should remove the APPROVE button.

I could not get it to work through the visual builder. When I switched the logic around--I removed the APPROVE button if the box was CHECKED--it did work.

I discovered that when the workflow reads the checkbox, it is reading checked as "True" but it is reading unchecked as NULL, not "False." This makes it so that you CANNOT use the visual builder to create the workflow condition because the visual builder only gives you two options "Checked" or "Unchecked," which it's evaluating as either T or F.