Canon raw files don't create image/thumbnail after uploading

Hi, I've installed the 1.81 version on Truenas (from the truenas repository), I'm trying to upload on the browser app (Chrome on win10) through "select from computer", and .CRW files only produce a broken image and thumb, exits are seemingly imported. Tried also with newer CR2 and they work... Should I file a GitHub issue? Do you want me to upload samples?