Api don't show value unpublish after set

When I have a record to which I set the date to change the status to not published, it is not visible (_unpublishingScheduledAt is undefined) when I retrieve this data from GraphqGL (Content Delivery API), unless I change some more fields and save these changes and then publish. Then the “_unpublishingScheduledAt” value is also immediately visible.

In the “API Explorer” the date changes are immediately visible. However, I noticed that requests coming out of “API Explorer” have additional headers that are not possible to set for Content Delivery API (request return error).