Using Airbyte, I was transferring data from Airtable to Google BigQuery. I was able to transfer some data, but some columns are missing. There were more than 70 fields (columns) in the original table, but only 17 have been transferred to GBQ. Several of the missing fields, as described in the documentation, are entirely empty. Unfortunately, about 30 columns with data are missing as well. Originally, I assumed that Airbyte was not correctly transferring all of the columns. Therefore, I tried a different connector, but I got the same result. Is there anyone who can explain why these columns are missing, and how to resolve this problem?