In both 3.22.02.00 and 16.05.09.000 the "summary" search results do not show item availability correctly, with ALL items showing as "<x> items, x<> available", even if the item is currently checked out. Clicking on the item title brings you to the details, where it shows correctly as checked out, and the OPAC search results also show the item properly as checked out in both the summary search results list and in the individual item details, it is only in the Staff client summary search results that it is improperly displayed.
This is a report from 2017, so it's hard to tell now, but it sounds like the Zebra indexing had not been happening so the items still showed as available instead of checked out in the result list. I am closing this INVALID.