Lise

Declared by the developer is why it is uneven. It is not the update removing things, it is which apps ever adopted it.

The browse-by-app check is the right answer and there is a detail that makes it more reliable: an app can declare actions and still show nothing in search, because the two systems are populated separately.

So the action list is the truth about what the app offers, and search is a separate index that can be stale or incomplete. People conclude an app lost its features when what actually broke is the index.