fenix series BehaviorDelegate oddities

Are there any known issues or idiosyncrasies with the fenix series when it comes to BehaviorDelegate? In the space of a few days I've had some users report that they can't navigate two different apps of mine with the physical buttons. I don't know whether or not (yet) things work with the touch screen. Similar reports from:

  • fenix 5s Sapphire
  • fenix 5x
  • fenix 7 Pro Sapphire Solar

Example: see the reviews in https://apps.garmin.com/apps/7ce6349b-d6b0-40e2-a791-5b1056fd3379