Created issue. A short description of the issue: Private Sheet public CSV export requires authentication when set not to What steps will reproduce the problem

Created issue. A short description of the issue: Private Sheet public CSV export requires authentication when set not to What steps will reproduce the problem? 1. create a private(!) Google Sheet 2. set public CSV export publication 3. access the endpoint without credentials What is the expected output? What do you see instead? If you see error messages, please provide them. You should receive a CSV file, you get HTML5 login form. Please provide any additional information below. Setting the Sheet to Public with a link fixes the problem, there's an obvious bug with the permissions taken from the Sheet, not the Export.