I tried reloading, restarting, the works. No change. It is not a problem with the SQL code. It is something to do with the ingestion of a parquet file format. Changing to json solved the issue, so I know it is not an SQL issue.
Something with the way Observable is ingesting the Parquet file is causing it to do something weird with the file. I viewed the file with a Parquet explorer. All the fields are there, all the data is there.