Adobe Lightroom Classic CC has a bug that prevents it from importing or previewing Nikon D850 NEF files shot while the camera is in Live Movie Mode set to DX (NEF files in 16:9 ratio). Adobe has just acknowledged they have duplicated the issue. Capture One Pro and Luminar open these files just fine. Apparently not a new issue with Lightroom and happened with the Nikon D800.
Thanks Chris!
