Advanced Search fails on requester is

Advanced Search fails on requester is

Hi, we've noticed that when using the advanced search functionality and search for Requester is, the systems returns 0 results.  However running the search as Requester contains returns some results, so there are clearly tickets logged.  Is this a known bug?
 
 
 
 
 
We are using : 9.1 Build  9120

Thanks Lynne
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