Thumbnail image canon generate

I have 1,000 raw images taken with a Nikon camera. All files are in NEF format and no thumbnails are generated. Other raw files like Cannon, Sony, Fujifilm all work fine. I did some more research on github but couldn't find a solution.This may be an error due to incompatible libraries with file formats for new generation cameras (nikon z system) Is there any way to work around this?