What changed?
 A new warning message now appears when "Sandbox Only" mode is enabled but publication Owners retain permission to publish. This does not change the behavior of Sandbox mode but introduces a new UI-level validation to prevent unwanted changes.
 
 Why was this change made?
 This message prompts admins to review permission settings and avoid potential production changes made in error. The goal is to support secure sandbox and prevent publishing mistakes by making permissions more transparent.
Who is affected?
Publication users with enough access to configure Publications and enable Sandbox mode.
How should I update my features or implementation?
No need for Updates. When enabling Sandbox Only mode, look for the new warning message and use the "Edit Permissions" option to review Owner permissions.