I would try setting it in config.php instead. If that works, it's a bug or limitation of the add-on. If it doesn't, I have no idea why as that's the only permission check aside from having admin style permissions.
If it’s an issue with the addon then it’s a conflict with the server setup, I still use this exclusively on my production site and development site without issues.
If it’s an issue with the addon then it’s a conflict with the server setup, I still use this exclusively on my production site and development site without issues.