title: BigQuery preview: Unknown error response from the server
body: <p>I'm getting an "Unknown error response from the server" error on a lot of my datasets, when trying to do a preview. I have this already since a couple of days with no workaround to fix it. Do you have any idea, what's happening or how to solve this? Is there a bug tracker for BigQuery or some other way to reach out to the Google Platform staff?</p>
  
  <p><a href="https://i.stack.imgur.com/OOgn2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OOgn2.png" alt="Unknown error response from the server"></a></p>