Unable to import .NEF generated by Nikon CoolScan IV ED

NEF images generated by Nikon CoolScan IV ED throw the following error on import (and show the skull):

"[rawspeed] (TEST.nef) virtual std::unique_ptrrawspeed::RawDecoder rawspeed::RawParser::getDecoder(const rawspeed::CameraMetaData*), line 91: No decoder found. Sorry."

NEF images generated by Nikon D-850 work fine.
NEF images generated by Nikon CoolScan IV ED work fine with Windows Photo Viewer and any Nikon viewer (ViewNX-i, etc.).

To reproduce: download a sample CoolScan NEF image (https://1drv.ms/u/s!Ag9FccAVark6341RfudWfblnDLWCPw?e=TIkqRv) and select [import] > [image...].

Notes:

1. Comparing the "image information" the only perhaps relevant differences between CoolScan NEF and Nikon camera NEF appear to be the "flags", "lens" and "datetime" attributes;
2. CoolScan NEF images show fine in the small preview area to the right of the "import image" dialog.

Thanks for your attention. If I have to post the issue elsewhere please let me know.

Platform:

• Darktable Version: 3.4.0
• OS: Windows 10 Pro (Ver: 20H2, OS Build: 19042.685)
• OpenCL: No