On raw.pixls.us are some files you can test. Rename them from tiff to nef after downloading. All the lossless ones open fine for me in 5.2.0 flatpak version.
Yes. i’m aware of the HE ‘issue’. My question was about the other available NEFs since I had a problem om my debian 5.0.1 DT install with various downloaded uncompressed/standard compressed NEFs