A new stub feature entry (internally Ufr) is defined as permanently disabled and hidden (isEnabled always returns false, isHidden: true), added into a list alongside other real feature entries. This indicates a feature that exists in code but is dark-launched and off.
Stubbed/disabled feature placeholder
An unnamed feature is permanently disabled and hidden in this build.
Nothing to try yetTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
InternalsArea: what it touches
In DevelopmentKind: in v2.1.261,
In DevelopmentSection of the release