[tvOS] ScrollView with Text does not scroll

I'm trying to do something so seemingly basic, yet I can't get it to work and I'm flummoxed.

In a basic, vanilla SwiftUI app for tvOS, embed a single Text element with a very long string (hundreds of lines) in it:

struct ContentView: View {
  var body: some View {
    ScrollView(.vertical) {
      Text(veryLargeString)
        .focusable()
    }
  }
}

Then fire up the app on tvOS, and it will not scroll. No matter what I do. Pressing arrow keys, swiping fast with my thumb, and nothing. It will not move. Ironically, in the Xcode SwiftUI Preview window—it does scroll, so that's always a fun tease.

What I do know is that the focus engine is throwing a few errors, so it's leading me to believe the issue is with how I have the focusable element attached. I'm using a combination of -UIFocusLoggingEnabled YES as well as listening for UIFocusSystem.movementDidFailNotification.

Unfortunately since this is SwiftUI, the notification failure and debugging logs aren't really all that actionable. Help appreciated!