Keywords: CiviCRM - Google Cloud Platform - Technical issue - Upgrade
Please verify what the correct permission is for (in /opt/bitnami/apps/civicrm/htdocs/sites/default/files/civicrm/templates_c):
drwxr-xr-x 2 bitnami daemon 4096 Jan 14 02:12 en_US
After the upgrade this is the permission I ended up with for en_US, and got error messages that CiviCRM didn't have access. I've done a chmod 777 for the time being and am apparently operational.