Using the Graph API does not return all custom fields from a SharePoint Document Library

Brass Contributor

I am using the Graph Explorer to return documents in a SharePoint Online site.
I use the following Get:
https://graph.microsoft.com/v1.0/sites/xxxxxxxx.sharepoint.com,9da6010e-e6ec-4cb4-b818-dbb137481ebc,... eq 'kingstreet.com'&top=1

However, DocumentType is not returned. It is a valid custom column which is a lookup field.

Even if I use expand=fields without a select, not all fields are returned.
How should I get this field to be displayed in the results?

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