I hate to break it to you Richard, but I think #63 was not the result of an anomalous manual admin operation. I just repeated the same process with the same file (on the staging server, at your request). The File Set has now been in "processing" state for 10 minutes. It's one 0.25MB file!
https://kge-data-staging.starinformatics.ca/metadata?kg_id=test-tgz-upload&fileset_version=1.0&kg_name=test-tgz-upload