Backup fails after updating to latest 3.4.0.beta3-dev

[Moin]

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Unable to backup or navigate to backups

Getting The backup has failed. Here’s the log: undefined method `start_with?' for nil /var/www/discourse/app/models/site_setting.rb:172:in `use_dualstack_endpoint’ /var/www/discourse/lib/s3_helper.rb:269:in `s3_options' /var/www/discourse/lib/backup_restore/s3_backup_store.rb:14:in `initialize’ /var/www/discourse/lib/backup_restore/backup_store.rb:17:in `new'` after a very recent rebuild to latest. In my case S3 is hosted with a vanilla AWS bucket. Could this be related?