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Dear Sir:

FastRawViewer doesn't invent pixels.
FastRawViewer never writes to raw files, never changes raw files, and of course never crops raw files.
Raw files are opened in FastRawViewer as read-only.

FastRawViewer displays pixel dimensions according to the setting in FastRawViewer Preferences (please see page 185 of the FastRawViewer manual, the manual comes with FastRawViewer, it is a fully searchable standard PDF, and you can open it through FastRawViewer main Menu -> Help -> 'PDF manual').

According to Nikon MakerNotes tag 0x001b, and this is a part of the NEF file itself, Nikon Z 9 uncropped raw is 8280 by 5520.

If that doesn't help, please make a sample out-of-camera NEF available, you can use any file sharing service and send the link to the file to support@fastrawviewer.com (we don't see anything attached to your post here)