Forward Custom Data Working But Fields Missing

I have a "Forward Custom Data" step in my flow that is working as I originally set it up. I need to add some more "custom data fields," but when I open the step, the fields are not shown. I know they must be there because they are still forwarding. How do I get them to show so I can add the new fields? I tried clicking the + but that only gives me a new field, it doesn't show the old ones. I've included the link to the workflow below. (This is also happening on the data forwarders I have setup on other workflows.)

Hi @iRestAdmin,

Please allow us some time to look into this concern. We will get back to you with an update soon.

Sure thing. The workflow I sent as an example was mission critical so I just redid the workflow setup. But you can look at this other one that's having the same issue. https://connect.pabbly.com/workflow/mapping/IjU3NjUwNTZlMDYzZjA0MzY1MjY5NTUzNjUxMzUi_pc

Thank you for sharing this information. We will get back to you shortly.

We have made some changes at the backend. The fields are visible now.

Thanks, I see them now.