Theninclude with condition not working in .NET core

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.NET-Core

var cert = _context.Certificates
             .Include(c => c.Staff)
             .ThenInclude(c => c.Department.Abbr.Contains("cs"))
             .Where(c => (int)c.CertificateType == 1)
             .AsNoTracking();

ThenInclude gives error as the expression should represent a property for access in .net core.

What I have tried:

The above code does not give syntax error. But while running it does not work.