Process custom fields in WordPress output bundle

Hi, in the WordPress Search Users output bundle, Make shows some custom fields that I have selected on the API tab in the Make WP plugin.
Question is: how can I process these fields, because Make does not show them as selectable fields in the modules following the WP Search Users module.

Here’s the output of Search Users:

I would have expected the custom fields to show up in the list of selectable fields at the green arrow in the screenshot below:

My goal is to set a filter that checks on course_completed_547 to be empty or not. If it’s not empty, then the student has completed the course, and the certificate can be sent.
Any suggestions how I can process these custom fields?
Thanks

Update: for some reason, after defining the same workflow from scratch, I am now able to refer to the custom fields:

case closed.

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