The ManageWiki API allows viewing of sensitive information set as visible to only ManageWiki right users (such as Discord webhooks)
This should be fixed immediately, likely by either creating another configuration variable to hide specific settings from the API, or by reverting ManageWiki changes to even support this, and move Discord webhooks back to PrivateSettings.php (which I really would rather not go that route as it's nice to allow users to add their own, and for support with other configs)