Having trouble with "File Path" search bin.

I'm trying to isolate all the footage linked to a particular drive in its own search bin, but for whatever reason the search bin that's created from my query contains all the footage in the project, not just the footage on the drive I'm trying to isolate.

Am I doing something wrong or is this some kind of bug? I'm on 23.1.0, but I had the same problem with earlier versions as well.