Set up 2 connections to BigQuery - why are some tables populating in one connection and not the other?

We have a connection to BigQuery set up, but Metabase is missing some of the tables so we created a 2nd connection to try to resolve the issue.

In the new connection, Metabase does see some of the tables that are missing from the previous connection, but the new connection is missing tables that have always appeared and worked smoothly in the first connection to BigQuery.

Any suggestions on how we can continue to troubleshoot this? It's a severe limitation.