Hi @tallpr24. That error is in the reports action, so it is a different issue, not related to the Gmail action/connection or to the change you made in the Gmail app. You didn't break anything; it was an issue from our side that has already been fixed. Sorry about that. Can you try again and let me know if your workflow works again?
Publishing your Gmail app to Production will not affect your workflow, and you can always revert to Testing again. Once your app is in Production, try to disconnect and connect again to the Gmail connection. You will see a different screen in the Oauth authentication, but you can still connect.
If you still have any issues, please share the logs or screenshots so we can help.