Hi John, thank you for posting in Q&A forum. Would you please confirm which version of SharePoint you are using?
This is the expected behavior in SharePoint 2013 workflow.
The feature of referring to a lookup field that targets the current list (as well as additional fields to the lookup column) has been removed from SharePoint 2013 workflow.
Currently, there is no alternative solution than using SharePoint 2010 workflow for this requirement.
Here is a post with similar issue for your reference: Lookup columns not visible in designer workflow.
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