As the title said, when the Digital Wellbeing's Focus Mode is enabled, the Twin Apps are still enabled even though the original app is being paused for notifications and cannot be opened while in Focus Mode.
Example of this is if I have a "Discord" app, and I use the Twin Apps for "Discord" so I can have 2 separate app for the account. If I add the "Discord" on the Focus Mode, only the original app will be silent/cannot be opened, and the Twin App "Discord" will still notify and can be open.