Verified on rancher:
Use file that the library trying to upload, added one uuid that present in inventory :

Start export process with default profile,
check that export is done, status is completed with error, error logs that showing us that some uuids are invalid is present, and marc file contains 1 record.

Thank you. This is the file that the library was trying to upload, Please test it with this file during validation:

sure, I will do a validation

While you are working on it , can you also please check if you can validate if the line is a UUID. There was a scenario today by a library where they were uploading a file with invalid lines and they did not know about it